1

Is it normal that the NTP pool DNS servers provide no AAAA records and only A records?

I would like to know the IPv6 address of some NTP servers of the pool.

NTP Test Results - pool.ntp.org

Execution date: Tue, 23 May 2017 23:10:46 GMT
NTP server: pool.ntp.org
test type: Query both.

IPv4 test results

Result:OK
Server:213.251.53.187
Stratum:2
Offset:0.000410
Delay:0.03044

IPv6 test results

Result:Fail
Server:Invalid hostname / IP address
Stratum:0
Offset:0.000000
Delay:0.00000

NTP Test Results - pool.ntp.org @ Tue, 23 May 2017 23:10:46 GMT

5

This came up some time ago on the ntp mailing list and indeed some servers are now reachable via IPv6, but not pool.ntp.org, as you noticed yourself:

$ host -t aaaa pool.ntp.org
pool.ntp.org has no AAAA record

$ for i in {0..3}; do host -t aaaa $i.pool.ntp.org; echo; done
0.pool.ntp.org has no AAAA record

1.pool.ntp.org has no AAAA record

2.pool.ntp.org has IPv6 address 2001:470:b:862::10
2.pool.ntp.org has IPv6 address 2600:3c00::e:d0bb
2.pool.ntp.org has IPv6 address 2600:3c03::f03c:91ff:fe67:49e9
2.pool.ntp.org has IPv6 address 2001:470:0:2c8::2

3.pool.ntp.org has no AAAA record

I'd suggest to inquire again on the mailing list about the IPv6 rollout plans.

1

Since IPv6 day (in 2011) IPv6 has been on all the 2. NTP pool domains. So 2.pool.ntp.org and all the 2.[area].pool.ntp.org domains. e.g. 2.uk.pool.ntp.org which is what I've been using. https://news.ntppool.org/2011/06/experimentally-enabling-ipv6/ https://news.ntppool.org/2011/06/continuing-ipv6-deployment/

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