Yes — sec.gov has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 sec.gov has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:38b::17b2 answers · 443✓ 2600:1408:c400:38c::17b2 answers · 443	yes
www over IPv6 www.sec.gov has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:38b::17b2 answers · 443✓ 2600:1408:c400:38c::17b2 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. sec-gov.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 6 of 13 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. a1-32.akam.net ✓a3-67.akam.net ✓a6-64.akam.net ✓a7-65.akam.net ✓a18-65.akam.net ✓a20-66.akam.net ✓a2-16-52-199.deploy.static.akamaitechnologies.com ✗a23-215-50-6.deploy.static.akamaitechnologies.com ✗a23-32-14-42.deploy.static.akamaitechnologies.com ✗a23-223-23-69.deploy.static.akamaitechnologies.com ✗a23-223-23-70.deploy.static.akamaitechnologies.com ✗a23-39-171-82.deploy.static.akamaitechnologies.com ✗a23-54-119-69.deploy.static.akamaitechnologies.com ✗	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://sec.gov/ via 2600:1408:c400:38b::17b2 → 301https://www.sec.gov/ via 2600:1408:c400:38b::17b2 → 200

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/sec.gov.svg)](https://aaaa.bot/sec.gov)

Check again

sec.gov Has IPv6

A (IPv4)	23.34.124.71
AAAA (IPv6)	2600:1408:c400:38b::17b2 2600:1408:c400:38c::17b2

www.sec.gov Has IPv6

Alias of	sec.gov.edgekey.net → e6066.dsca.akamaiedge.net
A (IPv4)	23.34.124.71
AAAA (IPv6)	2600:1408:c400:38b::17b2 2600:1408:c400:38c::17b2

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: sec.gov
Measured 2026-11-01 05:48:03 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    23.34.124.71
AAAA (IPv6): 2600:1408:c400:38b::17b2, 2600:1408:c400:38c::17b2
www AAAA:    2600:1408:c400:38b::17b2, 2600:1408:c400:38c::17b2

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: sec.gov has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:38b::17b2: answers (TCP 443)
    2600:1408:c400:38c::17b2: answers (TCP 443)
- www over IPv6: www.sec.gov has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:38b::17b2: answers (TCP 443)
    2600:1408:c400:38c::17b2: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 6 of 13 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 after 1 redirect: HTTP 200.
    https://sec.gov/ via 2600:1408:c400:38b::17b2 -> HTTP 301, certificate: valid
    https://www.sec.gov/ via 2600:1408:c400:38b::17b2 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/5vovNL-LgL

Permanent link: aaaa.bot/r/5vovNL-LgL · How we measure

Checked 2026-11-01 05:48:03 UTC. Full DNS report: dns.pizza/domain/sec.gov · JSON: /api/v1/sec.gov