noaa.gov publishes IPv6 but doesn't answer on it.

Has both IPv4 (A) and IPv6 (AAAA) addresses.

This is a saved measurement from 2026-10-30 23:04 UTC. Check noaa.gov live now

F
IPv6 readiness
Publishes IPv6 but doesn't answer on it — worse than having none.
Website over IPv6
noaa.gov has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4.
✗ 2610:20:8000:8c04::24 no answer✗ 2610:20:8800:8c00::24 no answer
broken
www over IPv6
www.noaa.gov has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:20ea:0:5:ff17:fd00:93a1 answers · 443✓ 2600:9000:20ea:9c00:5:ff17:fd00:93a1 answers · 443✓ 2600:9000:20ea:5400:5:ff17:fd00:93a1 answers · 443✓ 2600:9000:20ea:8800:5:ff17:fd00:93a1 answers · 443– 2600:9000:20ea:fe00:5:ff17:fd00:93a1 not tested– 2600:9000:20ea:8600:5:ff17:fd00:93a1 not tested– 2600:9000:20ea:7e00:5:ff17:fd00:93a1 not tested– 2600:9000:20ea:3800:5:ff17:fd00:93a1 not tested
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓
yes
Nameservers have IPv6
3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-01.noaa.gov ✓ns-02.noaa.gov ✓ns-03.noaa.gov ✓
yes

What's keeping noaa.gov from an A

  1. Fix or remove the AAAA record for noaa.gov
    Something published an IPv6 address but nothing answers on it, so IPv6 visitors wait for a timeout first. Either make the server listen on IPv6 (and allow ports 443/80 through its firewall), or delete the AAAA record until it does.

Check again

noaa.gov  Has IPv6

A (IPv4)137.75.88.7
137.75.88.52
AAAA (IPv6)2610:20:8000:8c04::24
2610:20:8800:8c00::24

www.noaa.gov  Has IPv6

Alias ofd1n02fmvrfzeno.cloudfront.net
A (IPv4)13.35.78.32
13.35.78.97
13.35.78.108
13.35.78.120
AAAA (IPv6)2600:9000:20ea:0:5:ff17:fd00:93a1
2600:9000:20ea:9c00:5:ff17:fd00:93a1
2600:9000:20ea:5400:5:ff17:fd00:93a1
2600:9000:20ea:8800:5:ff17:fd00:93a1
2600:9000:20ea:fe00:5:ff17:fd00:93a1
2600:9000:20ea:8600:5:ff17:fd00:93a1
2600:9000:20ea:7e00:5:ff17:fd00:93a1
2600:9000:20ea:3800:5:ff17:fd00:93a1

Browsers on dual-stack networks will usually pick IPv6 here (the "Happy Eyeballs" algorithm races both and prefers v6).

Copy the evidence — a citation-ready record of this measurement

 Permanent link: aaaa.bot/r/1a0a2ij3H0 · How we measure

Checked 2026-10-30 23:04:33 UTC. Full DNS report: dns.pizza/domain/noaa.gov · JSON: /api/v1/noaa.gov