Yes — mo.gov has IPv6.

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

Measured 2026-11-02 20:12 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check mo.gov now

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 mo.gov has 2 IPv6 addresses and answers on every one we tested. ✓ 2a02:e980:d1::15 answers · 443✓ 2a02:e980:d3::15 answers · 443	yes
www over IPv6 www.mo.gov has an AAAA record and answers on it. ✓ 2a02:e980:d1::15 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mxa-0001d001.gslb.pphosted.com ✗mxb-0001d001.gslb.pphosted.com ✗	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. edns3.ultradns.biz ✓edns3.ultradns.com ✓edns3.ultradns.net ✓edns3.ultradns.org ✓	yes

First measured 2026-11-02; last confirmed 2026-11-02.

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.

https://mo.gov/ via 2a02:e980:d1::15 → 200

works

What's keeping mo.gov from an A

Mail servers without IPv6
mxa-0001d001.gslb.pphosted.com, mxb-0001d001.gslb.pphosted.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

mo.gov Has IPv6

A (IPv4)	45.60.32.21 45.60.104.21
AAAA (IPv6)	2a02:e980:d1::15 2a02:e980:d3::15

www.mo.gov Has IPv6

Alias of	82hua4p.x.incapdns.net
A (IPv4)	45.60.32.21
AAAA (IPv6)	2a02:e980:d1::15

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

IPv6 measurement: mo.gov
Measured 2026-11-02 20:12:03 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    45.60.32.21, 45.60.104.21
AAAA (IPv6): 2a02:e980:d1::15, 2a02:e980:d3::15
www AAAA:    2a02:e980:d1::15

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: mo.gov has 2 IPv6 addresses and answers on every one we tested.
    2a02:e980:d1::15: answers (TCP 443)
    2a02:e980:d3::15: answers (TCP 443)
- www over IPv6: www.mo.gov has an AAAA record and answers on it.
    2a02:e980:d1::15: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): Loads over IPv6 with a valid certificate: HTTP 200.
    https://mo.gov/ via 2a02:e980:d1::15 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/hMh3YQ0WKT

Permanent link: aaaa.bot/r/hMh3YQ0WKT · How we measure

Checked 2026-11-02 20:12:03 UTC. Full DNS report: dns.pizza/domain/mo.gov · Age, certificate and blocklists: how.is/mo.gov · JSON: /api/v1/mo.gov