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