SIDN Labs TimeNL NTS server

Our four NTS-enabled unicast stratum 1 servers:

Name	Primary reference clock	Secondary reference clock	Remark
ntppool1.time.nl	Galileo+GPS	DCF77+Rubidium holdover
ntppool2.time.nl	Galileo+GPS	DCF77+Rubidium holdover
ntppool3.time.nl	Atomic clocks: UTC(VSL)	Rubidium holdover	pre-production
ntppool4.time.nl	Atomic clocks: UTC(VSL)	Rubidium holdover	pre-production

About NTS

Read about NTS here:

Using our servers

The original pilot server nts1.time.nl is still available for experiments.

⚠ It's not recommended to use that server in a production environment!

For production, use ntppool1.time.nl and ntppool2.time.nl.

You may want to add ntppool3.time.nl and ntppool4.time.nl for time derived from the UTC(VSL) atomic clocks.

Or use any.time.nl for our BGP anycasted NTS stratum 2 server.

Experimental servers

The experimental NTS server (nts1.time.nl) currently runs Chrony 4.8-2ubuntu1 in a special configuration that is NOT SUITABLE for serious use.

On another NTS server, ntpd-rs.sidnlabs.nl, we currently run an experiment with Version 1.8.0-1, an NTP/NTS server written in Rust, able to take part in an NTS pool (yes, NTS, not NTP). The one we run also has NTPv5 enabled - more specifically, with 'draft-ietf-ntp-ntpv5-08' in the Draft Identification Extension Field.

Roughtime

We also run an experiment with roughtime, currently with these settings:

{
  "servers": [
    {
      "name": "TimeNL-Roughtime",
      "version": "1",
      "publicKeyType": "ed25519",
      "publicKey": "v2CievhgKsxzlWPwIkYFUXeA51Akhkv5uhJCj1/kbiY=",
      "addresses": [
        {
          "protocol": "udp",
          "address": "rough.time.nl:2002"
        }
      ]
    }
  ]
}

This server implements 'draft-ietf-ntp-roughtime-12' from https://github.com/tannerryan/roughtime v1.14.0.

Please note that when you use the client from https://github.com/int08h/roughenough/, there may be a compatibility issue with the server we provide.

Please use this experimental service at your own risk, and make sure to add at least two other servers to your server list for redundancy.

SRV records

We also run experiments with SRV records for an NTS Pool. Please note that you require adapted client software to make use of them.

TimeNL:	`ntspool.time.nl`
GeoDNS experiment with various NTS servers, including those operated by others:	`[0123].srv.ntspool.nl`

You can check which geolocation is determined for you with: dig +short TXT whoami.srv.ntspool.nl

More information

Visit time.nl for further information about our TimeNL public service.

Or visit ntpinfo.sidnlabs.nl for our experimental NTP checker.