Network Time Security (NTS)

Created

  • 2020-04-07

Last Updated

  • 2026-06-02

Available Formats

Network Time Security Key Establishment Record Types

Expert(s)

  • Miroslav Lichvar, Daniel Franke

Reference

  • RFC 8915: Network Time Security for the Network Time Protocol

Available Formats

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 RFC 8915, Section 4.1.1
1 NTS Next Protocol Negotiation RFC 8915, Section 4.1.2
2 Error RFC 8915, Section 4.1.3
3 Warning RFC 8915, Section 4.1.4
4 AEAD Algorithm Negotiation RFC 8915, Section 4.1.5
5 New Cookie for NTPv4 RFC 8915, Section 4.1.6
6 NTPv4 Server Negotiation RFC 8915, Section 4.1.7
7 NTPv4 Port Negotiation RFC 8915, 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 RFC 8915

Network Time Security Next Protocols

Expert(s)

  • Miroslav Lichvar, Daniel Franke

Reference

  • RFC 8915: Network Time Security for the Network Time Protocol

Available Formats

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) RFC 8915
1-32767 Unassigned
32768-65535 Reserved for Private or Experimental Use RFC 8915

Network Time Security Error Codes

Expert(s)

  • Miroslav Lichvar, Daniel Franke

Reference

  • RFC 8915: Network Time Security for the Network Time Protocol

Available Formats

Range Registration Procedures
0-1023 IETF Review
1024-32767 Specification Required
32768-65535 Private or Experimental Use
Number Description Reference
0 Unrecognized Critical Record RFC 8915, Section 4.1.3
1 Bad Request RFC 8915, Section 4.1.3
2 Internal Server Error RFC 8915, Section 4.1.3
3-32767 Unassigned
32768-65535 Reserved for Private or Experimental Use RFC 8915

Network Time Security Warning Codes

Expert(s)

  • Miroslav Lichvar, Daniel Franke

Reference

  • RFC 8915: Network Time Security for the Network Time Protocol

Available Formats

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 RFC 8915