Internet Assigned Numbers Authority • Domains • Protocols • Numbers • About Packet CAPture (PCAP) Created 2026-04-13 Last Updated 2026-04-14 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry Included Below • PCAP-Related LinkTypes PCAP-Related LinkTypes Reference [RFC-ietf-opsawg-pcaplinktype-18] Available Formats [IMG] CSV Range Registration Procedures 0-65000 Expert Review 65001-65535 Experimental Use Value Name Description Change Reference Controller 0 LINKTYPE_NULL BSD loopback encapsulation [tcpdump] [LINKTYPE_NULL] 1 LINKTYPE_ETHERNET IEEE 802.3 Ethernet [tcpdump] [LINKTYPE_ETHERNET] 2 LINKTYPE_EXP_ETHERNET Xerox experimental 3Mb Ethernet [tcpdump] [PracConsEthDesign] 3 LINKTYPE_AX25 AX.25 layer 2 packets [tcpdump] [LINKTYPE_AX25] 4 LINKTYPE_PRONET Proteon PRONet Token Ring [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 5 LINKTYPE_CHAOS MIT Chaosnet [tcpdump] [AIM-628] 6 LINKTYPE_IEEE802_5 IEEE 802.5 Token Ring [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 7 LINKTYPE_ARCNET_BSD ARCNET Data Packets with BSD encapsulation [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 8 LINKTYPE_SLIP SLIP, with a direction header [tcpdump] [LINKTYPE_SLIP] 9 LINKTYPE_PPP PPP [tcpdump] [LINKTYPE_PPP] 10 LINKTYPE_FDDI FDDI: per ANSI INCITS 239-1994 [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 11-49 Reserved Do not use these values [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 50 LINKTYPE_PPP_HDLC PPP in HDLC-like framing [tcpdump] [LINKTYPE_PPP_HDLC] 51 LINKTYPE_PPP_ETHER PPPoE session packets [tcpdump] [LINKTYPE_PPP_ETHER] 52-98 Reserved Used historically by NetBSD [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 99 LINKTYPE_SYMANTEC_FIREWALL Symantec Enterprise Firewall [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 100 LINKTYPE_ATM_RFC1483 LLC/SNAP-encapsulated ATM [tcpdump] [LINKTYPE_ATM_RFC1483] 101 LINKTYPE_RAW IP without link-layer headers [tcpdump] [LINKTYPE_RAW] [RFC791] [RFC8200] 102 LINKTYPE_SLIP_BSDOS BSD/OS SLIP BPF header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 103 LINKTYPE_PPP_BSDOS BSD/OS PPP BPF header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 104 LINKTYPE_C_HDLC Cisco PPP with HDLC framing [tcpdump] [LINKTYPE_C_HDLC] 105 LINKTYPE_IEEE802_11 IEEE 802.11 wireless LAN [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 106 LINKTYPE_ATM_CLIP ATM Classical IP, with no header preceding [tcpdump] [https://www.tcpdump.org/linktypes.html] IP [RFC-ietf-opsawg-pcaplinktype-18] 107 LINKTYPE_FRELAY Frame Relay LAPF [tcpdump] [LINKTYPE_FRELAY] 108 LINKTYPE_LOOP OpenBSD loopback encapsulation [tcpdump] [LINKTYPE_LOOP] 109 LINKTYPE_ENC OpenBSD IPsec encapsulation [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 110 LINKTYPE_LANE8023 ATM LANE + 802.3 [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 111 LINKTYPE_HIPPI NetBSD HIPPI [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 112 LINKTYPE_HDLC NetBSD HDLC framing [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 113 LINKTYPE_LINUX_SLL Linux "cooked" capture encapsulation [tcpdump] [LINKTYPE_LINUX_SLL] 114 LINKTYPE_LTALK Apple LocalTalk [tcpdump] [LINKTYPE_LTALK] 115 LINKTYPE_ECONET Acorn Econet [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 116 LINKTYPE_IPFILTER OpenBSD ipfilter [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 117 LINKTYPE_PFLOG PF packet filter logging [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 118 LINKTYPE_CISCO_IOS Cisco-internal use [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 119 LINKTYPE_IEEE802_11_PRISM IEEE 802.11 wireless LAN, preceded by a [tcpdump] [LINKTYPE_IEEE802_11_PRISM] Prism monitor mode header 120 LINKTYPE_IEEE802_11_AIRONET 802.11 + FreeBSD Aironet radio metadata [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 121 LINKTYPE_HHDLC Siemens HiPath HDLC [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 122 LINKTYPE_IP_OVER_FC IP and ATM over Fibre Channel [tcpdump] [LINKTYPE_IP_OVER_FC] 123 LINKTYPE_SUNATM ATM traffic captured from a SunATM device [tcpdump] [LINKTYPE_SUNATM] 124 LINKTYPE_RIO RapidIO [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 125 LINKTYPE_PCI_EXP PCI Express [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 126 LINKTYPE_AURORA Xilinx Aurora link layer [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 127 LINKTYPE_IEEE802_11_RADIOTAP IEEE 802.11 wireless LAN, preceded by a [tcpdump] [Radiotap] Radiotap header 128 LINKTYPE_TZSP Tazmen Sniffer Protocol [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 129 LINKTYPE_ARCNET_LINUX ARCNET Data Packets with Linux encapsulation [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 130 LINKTYPE_JUNIPER_MLPPP Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 131 LINKTYPE_JUNIPER_MLFR Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 132 LINKTYPE_JUNIPER_ES Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 133 LINKTYPE_JUNIPER_GGSN Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 134 LINKTYPE_JUNIPER_MFR Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 135 LINKTYPE_JUNIPER_ATM2 Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 136 LINKTYPE_JUNIPER_SERVICES Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 137 LINKTYPE_JUNIPER_ATM1 Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 138 LINKTYPE_APPLE_IP_OVER_IEEE1394 Apple IP-over-IEEE 1394 cooked header [tcpdump] [LINKTYPE_APPLE_IP_OVER_IEEE1394] 139 LINKTYPE_MTP2_WITH_PHDR SS7 MTP2 frames, with a pseudo-header [tcpdump] [LINKTYPE_MTP2_WITH_PHDR] 140 LINKTYPE_MTP2 SS7 MTP2 packets [tcpdump] [LINKTYPE_MTP2] 141 LINKTYPE_MTP3 SS7 MTP3 packets [tcpdump] [LINKTYPE_MTP3] 142 LINKTYPE_SCCP SS7 SCCP packets [tcpdump] [LINKTYPE_SCCP] 143 LINKTYPE_DOCSIS DOCSIS MAC frames [tcpdump] [DOCSIS-4.0-MULP] 144 LINKTYPE_LINUX_IRDA Linux-IrDA packets [tcpdump] [LINKTYPE_LINUX_IRDA] 145 LINKTYPE_IBM_SP IBM SP switch [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 146 LINKTYPE_IBM_SN IBM Next Federation switch [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 147 LINKTYPE_RESERVED_01 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 148 LINKTYPE_RESERVED_02 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 149 LINKTYPE_RESERVED_03 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 150 LINKTYPE_RESERVED_04 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 151 LINKTYPE_RESERVED_05 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 152 LINKTYPE_RESERVED_06 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 153 LINKTYPE_RESERVED_07 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 154 LINKTYPE_RESERVED_08 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 155 LINKTYPE_RESERVED_09 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 156 LINKTYPE_RESERVED_10 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 157 LINKTYPE_RESERVED_11 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 158 LINKTYPE_RESERVED_12 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 159 LINKTYPE_RESERVED_13 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 160 LINKTYPE_RESERVED_14 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 161 LINKTYPE_RESERVED_15 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 162 LINKTYPE_RESERVED_16 For private use (deprecated) [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 163 LINKTYPE_IEEE802_11_AVS IEEE 802.11 wireless LAN, preceded by an AVS [tcpdump] [AVS] header 164 LINKTYPE_JUNIPER_MONITOR Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 165 LINKTYPE_BACNET_MS_TP BACnet MS/TP frames [tcpdump] [LINKTYPE_BACNET_MS_TP] 166 LINKTYPE_PPP_PPPD PPP preceded by a direction octet and an [tcpdump] [LINKTYPE_PPP_PPPD] HDLC-like control field 167 LINKTYPE_JUNIPER_PPPOE Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 168 LINKTYPE_JUNIPER_PPPOE_ATM Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 169 LINKTYPE_GPRS_LLC General Packet Radio Service Logical Link [tcpdump] [3GPP TS 04.64] Control, as per 3GPP TS 04.64 170 LINKTYPE_GPF_T Transparent-mapped generic framing procedure [tcpdump] [G.7041] 171 LINKTYPE_GPF_F Frame-mapped generic framing procedure [tcpdump] [G.7041] 172 LINKTYPE_GCOM_T1E1 Gcom T1/E1 line monitoring equipment [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 173 LINKTYPE_GCOM_SERIAL Gcom T1/E1 line monitoring equipment [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 174 LINKTYPE_JUNIPER_PIC_PEER Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 175 LINKTYPE_ERF_ETH Endace TYPE_ETH ERF records [tcpdump] [LINKTYPE_ERF] 176 LINKTYPE_ERF_POS Endace TYPE_POS_HDLC ERF records [tcpdump] [LINKTYPE_ERF] 177 LINKTYPE_LINUX_LAPD Linux vISDN LAPD frames [tcpdump] [LINKTYPE_LINUX_LAPD] 178 LINKTYPE_JUNIPER_ETHER Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 179 LINKTYPE_JUNIPER_PPP Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 180 LINKTYPE_JUNIPER_FRELAY Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 181 LINKTYPE_JUNIPER_CHDLC Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 182 LINKTYPE_MFR FRF.16.1 Multi-Link Frame Relay frames [tcpdump] [LINKTYPE_MFR] 183 LINKTYPE_JUNIPER_VP Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 184 LINKTYPE_A429 ARINC 429 frames [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 185 LINKTYPE_A653_ICM Arinc 653 Interpartition Communication [tcpdump] [https://www.tcpdump.org/linktypes.html] messages [RFC-ietf-opsawg-pcaplinktype-18] 186 LINKTYPE_USB_FREEBSD USB traffic captured on FreeBSD [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 187 LINKTYPE_BLUETOOTH_HCI_H4 Bluetooth HCI UART Transport Layer packets [tcpdump] [LINKTYPE_BLUETOOTH_HCI_H4] 188 LINKTYPE_IEEE802_16_MAC_CPS IEEE 802.16 MAC Common Part Sublayer [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 189 LINKTYPE_USB_LINUX USB packets, beginning with a Linux USB [tcpdump] [LINKTYPE_USB_LINUX] header 190 LINKTYPE_CAN20B Controller Area Network (CAN) v. 2.0B [tcpdump] [https://www.tcpdump.org/linktypes.html] packets [RFC-ietf-opsawg-pcaplinktype-18] 191 LINKTYPE_IEEE802_15_4_LINUX IEEE 802.15.4 with address fields padded by [tcpdump] [https://www.tcpdump.org/linktypes.html] Linux [RFC-ietf-opsawg-pcaplinktype-18] 192 LINKTYPE_PPI Per-Packet Information header preceding [tcpdump] [LINKTYPE_PPI] packet data 193 LINKTYPE_IEEE802_16_MAC_CPS_RADIO 802.16 MAC Common Part Sublayer plus radio [tcpdump] [https://www.tcpdump.org/linktypes.html] header [RFC-ietf-opsawg-pcaplinktype-18] 194 LINKTYPE_JUNIPER_ISM Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 195 LINKTYPE_IEEE802_15_4_WITHFCS IEEE 802.15.4 with FCS [tcpdump] [LINKTYPE_IEEE802_15_4_WITHFCS] 196 LINKTYPE_SITA Various link-layer types, with a [tcpdump] [LINKTYPE_SITA] pseudo-header 197 LINKTYPE_ERF Endace ERF records [tcpdump] [LINKTYPE_ERF] 198 LINKTYPE_RAIF1 Ethernet packets captured from a u10 [tcpdump] [https://www.tcpdump.org/linktypes.html] Networks board [RFC-ietf-opsawg-pcaplinktype-18] 199 LINKTYPE_IPMB_KONTRON IPMB packet for IPMI, with a 2-octet header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 200 LINKTYPE_JUNIPER_ST Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 201 LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR Bluetooth HCI UART Transport Layer packets [tcpdump] [LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR] with a direction pseudo-header 202 LINKTYPE_AX25_KISS KISS frames between a host and an AX.25 TNC [tcpdump] [LINKTYPE_AX25_KISS] 203 LINKTYPE_LAPD Q.921 LAPD frames [tcpdump] [LINKTYPE_LAPD] 204 LINKTYPE_PPP_WITH_DIR PPP, with a direction header [tcpdump] [LINKTYPE_PPP_WITH_DIR] 205 LINKTYPE_C_HDLC_WITH_DIR Cisco PPP with HDLC framing, with a [tcpdump] [LINKTYPE_C_HDLC_WITH_DIR] direction header 206 LINKTYPE_FRELAY_WITH_DIR Frame Relay LAPF, with a direction header [tcpdump] [LINKTYPE_FRELAY_WITH_DIR] 207 LINKTYPE_LAPB_WITH_DIR X.25 LAPB, with a direction header [tcpdump] [LINKTYPE_LAPB_WITH_DIR] 208 WillBarker-Proprietary Proprietary Link-Layer type [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 209 LINKTYPE_I2C_LINUX Linux I2C packets [tcpdump] [LINKTYPE_I2C_LINUX] 210 LINKTYPE_FLEXRAY FlexRay frames or symbols, with a [tcpdump] [LINKTYPE_FLEXRAY] pseudo-header 211 LINKTYPE_MOST Media Oriented Systems Transport (MOST) bus [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 212 LINKTYPE_LIN Local Interconnect Network (LIN) automotive [tcpdump] [LINKTYPE_LIN] bus, with a metadata header 213 LINKTYPE_X2E_SERIAL X2E serial line captures [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 214 LINKTYPE_X2E_XORAYA X2E Xoraya data loggers [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 215 LINKTYPE_IEEE802_15_4_NONASK_PHY IEEE 802.15.4 with PHY header [tcpdump] [LINKTYPE_IEEE802_15_4_NONASK_PHY] 216 LINKTYPE_LINUX_EVDEV Linux evdev messages [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 217 LINKTYPE_GSMTAP_UM GSM Um interface, with gsmtap header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 218 LINKTYPE_GSMTAP_ABIS GSM Abis interface, with gsmtap header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 219 LINKTYPE_MPLS MPLS packets with MPLS label as the header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 220 LINKTYPE_USB_LINUX_MMAPPED USB packets, beginning with an extended [tcpdump] [LINKTYPE_USB_LINUX_MMAPPED] Linux USB header 221 LINKTYPE_DECT DECT packets, with a pseudo-header [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 222 LINKTYPE_AOS OS Space Data Link Protocol [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 223 LINKTYPE_WIHART Wireless HART (Highway Addressable Remote [tcpdump] [https://www.tcpdump.org/linktypes.html] Transducer) [RFC-ietf-opsawg-pcaplinktype-18] 224 LINKTYPE_FC_2 Fibre Channel FC-2 frames [tcpdump] [LINKTYPE_FC_2] 225 LINKTYPE_FC_2_WITH_FRAME_DELIMS Fibre Channel FC-2 frames with SOF and EOF [tcpdump] [LINKTYPE_FC_2_WITH_FRAME_DELIMS] 226 LINKTYPE_IPNET Solaris ipnet [tcpdump] [LINKTYPE_IPNET] 227 LINKTYPE_CAN_SOCKETCAN Controller Area Network (CAN) frames, with a [tcpdump] [LINKTYPE_CAN_SOCKETCAN] metadata header 228 LINKTYPE_IPV4 IPv4 without link-layer headers [tcpdump] [LINKTYPE_IPV4] [RFC791] 229 LINKTYPE_IPV6 IPv6 without link-layer headers [tcpdump] [LINKTYPE_IPV6] [RFC8200] 230 LINKTYPE_IEEE802_15_4_NOFCS IEEE 802.15.4 without FCS [tcpdump] [LINKTYPE_IEEE802_15_4_NOFCS] 231 LINKTYPE_DBUS D-Bus messages [tcpdump] [LINKTYPE_DBUS] 232 LINKTYPE_JUNIPER_VS Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 233 LINKTYPE_JUNIPER_SRX_E2E Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 234 LINKTYPE_JUNIPER_FIBRECHANNEL Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 235 LINKTYPE_DVB_CI DVB-CI messages, with a pseudo-header [tcpdump] [DVB-CI-PCAP] 236 LINKTYPE_MUX27010 Variant of 3GPP TS 27.010 multiplexing [tcpdump] [LINKTYPE_MUX27010] protocol 237 LINKTYPE_STANAG_5066_D_PDU STANAG 5066 D_PDUs [tcpdump] [LINKTYPE_STANAG_5066_D_PDU] 238 LINKTYPE_JUNIPER_ATM_CEMIC Juniper Networks [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 239 LINKTYPE_NFLOG Linux netlink NETLINK NFLOG socket log [tcpdump] [LINKTYPE_NFLOG] messages 240 LINKTYPE_NETANALYZER Ethernet frames with netANALYZER [tcpdump] [LINKTYPE_NETANALYZER] pseudo-header 241 LINKTYPE_NETANALYZER_TRANSPARENT Ethernet frames with netANALYZER [tcpdump] [LINKTYPE_NETANALYZER_TRANSPARENT] pseudo-header, preamble, and SFD 242 LINKTYPE_IPOIB IP-over-InfiniBand [tcpdump] [LINKTYPE_IPOIB] 243 LINKTYPE_MPEG_2_TS MPEG-2 Transport Stream transport packets [tcpdump] [LINKTYPE_MPEG_2_TS] 244 LINKTYPE_NG40 Frames from ng4T GmbH's ng40 protocol tester [tcpdump] [LINKTYPE_NG40] 245 LINKTYPE_NFC_LLCP NFC Logical Link Control Protocol frames, [tcpdump] [LINKTYPE_NFC_LLCP] with a pseudo-header 246 LINKTYPE_PFSYNC pfsync output [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 247 LINKTYPE_INFINIBAND InfiniBand data packets [tcpdump] [LINKTYPE_INFINIBAND] 248 LINKTYPE_SCTP SCTP packets, with no lower-level protocols [tcpdump] [RFC9260] such as IPv4 or IPv6 249 LINKTYPE_USBPCAP USB packets, beginning with a USBPcap header [tcpdump] [USBPcap] 250 LINKTYPE_RTAC_SERIAL Serial-line packet from the Schweitzer [tcpdump] [LINKTYPE_RTAC_SERIAL] Engineering Laboratories RTAC product 251 LINKTYPE_BLUETOOTH_LE_LL Bluetooth Low Energy link-layer packets [tcpdump] [LINKTYPE_BLUETOOTH_LE_LL] 252 LINKTYPE_WIRESHARK_UPPER_PDU Wireshark [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 253 LINKTYPE_NETLINK Linux Netlink capture encapsulation [tcpdump] [LINKTYPE_NETLINK] 254 LINKTYPE_BLUETOOTH_LINUX_MONITOR Bluetooth Linux Monitor [tcpdump] [LINKTYPE_BLUETOOTH_LINUX_MONITOR] 255 LINKTYPE_BLUETOOTH_BREDR_BB Bluetooth Basic Rate and Enhanced Data Rate [tcpdump] [LINKTYPE_BLUETOOTH_BREDR_BB] baseband packets 256 LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR Bluetooth Low Energy link-layer packets [tcpdump] [LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR] 257 LINKTYPE_PROFIBUS_DL PROFIBUS data link layer packets [tcpdump] [LINKTYPE_PROFIBUS_DL] 258 LINKTYPE_PKTAP Apple PKTAP capture encapsulation [tcpdump] [LINKTYPE_PKTAP] 259 LINKTYPE_EPON Ethernet-over-passive-optical-network [tcpdump] [LINKTYPE_EPON] packets, including preamble octets 260 LINKTYPE_IPMI_HPM_2 IPMI HPM.2 trace packets [tcpdump] [LINKTYPE_IPMI_HPM_2] 261 LINKTYPE_ZWAVE_R1_R2 Z-Wave RF profile R1 and R2 packets [tcpdump] [LINKTYPE_ZWAVE_R1_R2] 262 LINKTYPE_ZWAVE_R3 Z-Wave RF profile R3 packets [tcpdump] [LINKTYPE_ZWAVE_R3] WattStopper Digital Lighting Management 263 LINKTYPE_WATTSTOPPER_DLM (DLM) and Legrand Nitoo Open protocol [tcpdump] [LINKTYPE_WATTSTOPPER_DLM] packets 264 LINKTYPE_ISO_14443 ISO 14443 contactless smartcard messages [tcpdump] [ISO14443-PCAP] 265 LINKTYPE_RDS IEC 62106 Radio data system (RDS) groups [tcpdump] [LINKTYPE_RDS] 266 LINKTYPE_USB_DARWIN USB packets captured on a Darwin-based [tcpdump] [LINKTYPE_USB_DARWIN] operating system (macOS, etc.) 267 LINKTYPE_OPENFLOW OpenBSD DLT_OPENFLOW [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 268 LINKTYPE_SDLC SNA SDLC packets [tcpdump] [LINKTYPE_SDLC] 269 LINKTYPE_TI_LLN_SNIFFER Texas Instruments protocol sniffer [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 270 LINKTYPE_LORATAP LoRaWan packets with a LoRaTap pseudo-header [tcpdump] [LINKTYPE_LORATAP] 271 LINKTYPE_VSOCK Protocol for communication between host and [tcpdump] [LINKTYPE_VSOCK] guest machines in VMware and KVM hypervisors 272 LINKTYPE_NORDIC_BLE Messages to and from a Nordic Semiconductor [tcpdump] [LINKTYPE_NORDIC_BLE] nRF Sniffer for Bluetooth LE packets 273 LINKTYPE_DOCSIS31_XRA31 DOCSIS packets and bursts, preceded by a [tcpdump] [DOCSIS-XRA] [DOCSIS-4.0-MULP] pseudo-header 274 LINKTYPE_ETHERNET_MPACKET IEEE 802.3 mPackets [tcpdump] [LINKTYPE_ETHERNET_MPACKET] 275 LINKTYPE_DISPLAYPORT_AUX DisplayPort AUX channel monitoring messages [tcpdump] [LINKTYPE_DISPLAYPORT_AUX] 276 LINKTYPE_LINUX_SLL2 Linux cooked capture encapsulation v2 [tcpdump] [LINKTYPE_LINUX_SLL2] 277 LINKTYPE_SERCOS_MONITOR Sercos Monitor [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] 278 LINKTYPE_OPENVIZSLA OpenVizsla FPGA-based USB sniffer [tcpdump] [OpenVizsla] 279 LINKTYPE_EBHSCR Elektrobit High Speed Capture and Replay [tcpdump] [EBHSCR] (EBHSCR) format 280 LINKTYPE_VPP_DISPATCH fd.io VPP graph dispatcher trace records [tcpdump] [FD.io-VPP] 281 LINKTYPE_DSA_TAG_BRCM Ethernet frames, with a Broadcom switch tag [tcpdump] [LINKTYPE_DSA_TAG_BRCM] inserted 282 LINKTYPE_DSA_TAG_BRCM_PREPEND Ethernet frames, with a Broadcom switch tag [tcpdump] [LINKTYPE_DSA_TAG_BRCM_PREPEND] prepended 283 LINKTYPE_IEEE802_15_4_TAP IEEE 802.15.4 with a tap header preceding it [tcpdump] [Exegin-802.15.4-TAP] 284 LINKTYPE_DSA_TAG_DSA Ethernet frames, with a Marvell DSA switch [tcpdump] [LINKTYPE_DSA_TAG_DSA] tag inserted 285 LINKTYPE_DSA_TAG_EDSA Ethernet frames, with a Marvell EDSA switch [tcpdump] [LINKTYPE_DSA_TAG_EDSA] tag inserted 286 LINKTYPE_ELEE ELEE lawful intercept protocol [tcpdump] [https://www.tcpdump.org/linktypes.html] [RFC-ietf-opsawg-pcaplinktype-18] Serial frames transmitted between a host and 287 LINKTYPE_Z_WAVE_SERIAL a Z-Wave chip over an RS-232 or USB serial [tcpdump] [Z-WAVE-SERIAL, section 5] connection 288 LINKTYPE_USB_2_0 USB 2.0, 1.1, or 1.0 packets [tcpdump] [LINKTYPE_USB_2_0] 289 LINKTYPE_ATSC_ALP ATSC Link-Layer Protocol frames [tcpdump] [LINKTYPE_ATSC_ALP] 290 LINKTYPE_ETW Event Tracing for Windows messages [tcpdump] [LINKTYPE_ETW] 291 LINKTYPE_NETANALYZER_NG Hilscher Gesellschaft fuer Systemautomation [tcpdump] [https://www.tcpdump.org/linktypes.html] mbH netANALYZER NG hardware and software [RFC-ietf-opsawg-pcaplinktype-18] 292 LINKTYPE_ZBOSS_NCP ZBOSS NCP Serial Protocol, with a [tcpdump] [LINKTYPE_ZBOSS_NCP] pseudo-header 293 LINKTYPE_USB_2_0_LOW_SPEED Low-Speed USB 2.0, 1.1, or 1.0 packets [tcpdump] [LINKTYPE_USB_2_0_LOW_SPEED] 294 LINKTYPE_USB_2_0_FULL_SPEED Full-Speed USB 2.0, 1.1, or 1.0 packets [tcpdump] [LINKTYPE_USB_2_0_FULL_SPEED] 295 LINKTYPE_USB_2_0_HIGH_SPEED High-Speed USB 2.0 packets [tcpdump] [LINKTYPE_USB_2_0_HIGH_SPEED] 296 LINKTYPE_AUERSWALD_LOG Auerswald Logger Protocol [tcpdump] [Auerswald-Logger] 297 LINKTYPE_ZWAVE_TAP Z-Wave packets, with a metadata header [tcpdump] [LINKTYPE_ZWAVE_TAP] 298 LINKTYPE_SILABS_DEBUG_CHANNEL Silicon Labs debug channel protocol [tcpdump] [Silabs-Debug-Channel] 299 LINKTYPE_FIRA_UCI Ultra-wideband (UWB) controller interface [tcpdump] [LINKTYPE_FIRA_UCI] protocol (UCI) 300 LINKTYPE_MDB MDB (Multi-Drop Bus) protocol [tcpdump] [MDB-PCAP] 301 LINKTYPE_DECT_NR DECT-2020 New Radio (NR) MAC layer [tcpdump] [LINKTYPE_DECT_NR] 302-65000 Unassigned 65001-65535 Reserved for Experimental Use [RFC-ietf-opsawg-pcaplinktype-18] Contact Information ID Name Contact URI Last Updated [tcpdump] linktype@tcpdump.org mailto:linktype&tcpdump.org 2026-04-13 Licensing Terms