Network Time Security (NTS)

Created
2020-04-07
Last Updated
2026-06-02
Available Formats

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Registries Included Below

Network Time Security Key Establishment Record Types

Expert(s)
Miroslav Lichvar, Daniel Franke
Reference
[RFC8915]
Available Formats

CSV
Range Registration Procedures
0-1023 IETF Review
1024-16383 Specification Required
16384-32767 Private or Experimental Use
Record Type Number Description Reference
0 End of Message [RFC8915, Section 4.1.1]
1 NTS Next Protocol Negotiation [RFC8915, Section 4.1.2]
2 Error [RFC8915, Section 4.1.3]
3 Warning [RFC8915, Section 4.1.4]
4 AEAD Algorithm Negotiation [RFC8915, Section 4.1.5]
5 New Cookie for NTPv4 [RFC8915, Section 4.1.6]
6 NTPv4 Server Negotiation [RFC8915, Section 4.1.7]
7 NTPv4 Port Negotiation [RFC8915, Section 4.1.8]
8 Keep Alive (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.1]
9 Supported Next Protocol List (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.2]
10 Supported Algorithm List (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.3]
11 List Server Names (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.4]
12 Fixed Key Request (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.5]
13 NTP Server Deny (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.6]
14 Authentication Token (TEMPORARY - registered 2026-06-02, expires 2027-06-02) [draft-ietf-ntp-nts-keyexchange-pool-00, Section 6.7]
15-1023 Unassigned
1024 Compliant AES-128-GCM-SIV Exporter Context [https://chrony-project.org/doc/spec/nts-compliant-128gcm.html]
1025-16383 Unassigned
16384-32767 Reserved for Private or Experimental Use [RFC8915]

Network Time Security Next Protocols

Expert(s)
Miroslav Lichvar, Daniel Franke
Reference
[RFC8915]
Available Formats

CSV
Range Registration Procedures
0-1023 IETF Review
1024-32767 Specification Required
32768-65535 Private or Experimental Use
Protocol ID Protocol Name Reference
0 Network Time Protocol version 4 (NTPv4) [RFC8915]
1-32767 Unassigned
32768-65535 Reserved for Private or Experimental Use [RFC8915]

Network Time Security Error Codes

Expert(s)
Miroslav Lichvar, Daniel Franke
Reference
[RFC8915]
Available Formats

CSV
Range Registration Procedures
0-1023 IETF Review
1024-32767 Specification Required
32768-65535 Private or Experimental Use
Number Description Reference
0 Unrecognized Critical Record [RFC8915, Section 4.1.3]
1 Bad Request [RFC8915, Section 4.1.3]
2 Internal Server Error [RFC8915, Section 4.1.3]
3-32767 Unassigned
32768-65535 Reserved for Private or Experimental Use [RFC8915]

Network Time Security Warning Codes

Expert(s)
Miroslav Lichvar, Daniel Franke
Reference
[RFC8915]
Available Formats

CSV
Range Registration Procedures
0-1023 IETF Review
1024-32767 Specification Required
32768-65535 Private or Experimental Use
Number Description Reference
0-32767 Unassigned
32768-65535 Reserved for Private or Experimental Use [RFC8915]