Internet Assigned Numbers Authority Network Time Protocol (NTP) Parameters Created 2010-03-25 Last Updated 2023-05-03 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registries included below • NTP Reference Identifier Codes • NTP Kiss-o'-Death Codes • NTP Extension Field Types NTP Reference Identifier Codes Registration Procedure(s) First Come First Served Reference [RFC5905] Note Codes beginning with the character "X" are reserved for experimentation and development. IANA cannot assign them. Available Formats [IMG] CSV ID Clock Source Reference GOES Geosynchronous Orbit Environment Satellite [RFC5905] GPS Global Position System [RFC5905] GAL Galileo Positioning System [RFC5905] PPS Generic pulse-per-second [RFC5905] IRIG Inter-Range Instrumentation Group [RFC5905] WWVB LF Radio WWVB Ft. Collins, CO 60 kHz [RFC5905] DCF LF Radio DCF77 Mainflingen, DE 77.5 kHz [RFC5905] HBG LF Radio HBG Prangins, HB 75 kHz [RFC5905] MSF LF Radio MSF Anthorn, UK 60 kHz [RFC5905] JJY LF Radio JJY Fukushima, JP 40 kHz, Saga, JP 60 kHz [RFC5905] LORC MF Radio LORAN C station, 100 kHz [RFC5905] TDF MF Radio Allouis, FR 162 kHz [RFC5905] CHU HF Radio CHU Ottawa, Ontario [RFC5905] WWV HF Radio WWV Ft. Collins, CO [RFC5905] WWVH HF Radio WWVH Kauai, HI [RFC5905] NIST NIST telephone modem [RFC5905] ACTS NIST telephone modem [RFC5905] USNO USNO telephone modem [RFC5905] PTB European telephone modem [RFC5905] DFM UTC(DFM) [DFM_AS][Jürgen_Appel] NTP Kiss-o'-Death Codes Registration Procedure(s) First Come First Served Reference [RFC5905] Note Codes beginning with the character "X" are reserved for experimentation and development. IANA cannot assign them. Available Formats [IMG] CSV Code Meaning Reference ACST The association belongs to a unicast server [RFC5905] AUTH Server authentication failed [RFC5905] AUTO Autokey sequence failed [RFC5905] BCST The association belongs to a broadcast server [RFC5905] CRYP Cryptographic authentication or identification failed [RFC5905] DENY Access denied by remote server [RFC5905] DROP Lost peer in symmetric mode [RFC5905] RSTR Access denied due to local policy [RFC5905] INIT The association has not yet synchronized for the first time [RFC5905] MCST The association belongs to a dynamically discovered server [RFC5905] NKEY No key found. Either the key was never installed or is not trusted [RFC5905] NTSN Network Time Security (NTS) negative-acknowledgment (NAK) [RFC8915, Section 5.7] RATE Rate exceeded. The server has temporarily denied access because the client exceeded the rate threshold [RFC5905] RMOT Alteration of association from a remote host running ntpdc. [RFC5905] STEP A step change in system time has occurred, but the association has not yet resynchronized [RFC5905] NTP Extension Field Types Registration Procedure(s) IETF Review Reference [RFC5905] Available Formats [IMG] CSV Field Type Meaning Reference 0x0002 No-Operation Request [RFC5906] 0x0104 Unique Identifier [RFC8915, Section 5.3] 0x0204 NTS Cookie [RFC8915, Section 5.4] 0x0304 NTS Cookie Placeholder [RFC8915, Section 5.5] 0x0404 NTS Authenticator and Encrypted Extension Fields [RFC8915, Section 5.6] 0x8002 No-Operation Response [RFC5906] 0xC002 No-Operation Error Response [RFC5906] 0x0102 Association Message Request [RFC5906] 0x8102 Association Message Response [RFC5906] 0xC102 Association Message Error Response [RFC5906] 0x0202 Certificate Message Request [RFC5906] 0x8202 Certificate Message Response [RFC5906] 0xC202 Certificate Message Error Response [RFC5906] 0x0302 Cookie Message Request [RFC5906] 0x8302 Cookie Message Response [RFC5906] 0xC302 Cookie Message Error Response [RFC5906] 0x0402 Autokey Message Request [RFC5906] 0x8402 Autokey Message Response [RFC5906] 0xC402 Autokey Message Error Response [RFC5906] 0x0502 Leapseconds Message Request [RFC5906] 0x8502 Leapseconds Message Response [RFC5906] 0xC502 Leapseconds Message Error Response [RFC5906] 0x0602 Sign Message Request [RFC5906] 0x8602 Sign Message Response [RFC5906] 0xC602 Sign Message Error Response [RFC5906] 0x0702 IFF Identity Message Request [RFC5906] 0x8702 IFF Identity Message Response [RFC5906] 0xC702 IFF Identity Message Error Response [RFC5906] 0x0802 GQ Identity Message Request [RFC5906] 0x8802 GQ Identity Message Response [RFC5906] 0xC802 GQ Identity Message Error Response [RFC5906] 0x0902 MV Identity Message Request [RFC5906] 0x8902 MV Identity Message Response [RFC5906] 0xC902 MV Identity Message Error Response [RFC5906] 0x2005 Checksum Complement [RFC7821] Contact Information ID Name Organization Contact URI Last Updated [DFM_AS] DFM A/S https://dfm.dk 2023-05-03 [Jürgen_Appel] Jürgen Appel DFM A/S mailto:jap&dfm.dk 2023-05-03 Licensing Terms