Yes — epa.gov has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
epa.gov has an AAAA record and answers on it.
✓ 2620:117:506f:15::f022 answers · 443
yes
www over IPv6
www.epa.gov has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:2305:9400:10:f3db:af40:93a1 answers · 443✓ 2600:9000:2305:e600:10:f3db:af40:93a1 answers · 443✓ 2600:9000:2305:4400:10:f3db:af40:93a1 answers · 443✓ 2600:9000:2305:8a00:10:f3db:af40:93a1 answers · 443– 2600:9000:2305:a00:10:f3db:af40:93a1 not tested– 2600:9000:2305:e200:10:f3db:af40:93a1 not tested– 2600:9000:2305:3e00:10:f3db:af40:93a1 not tested– 2600:9000:2305:e800:10:f3db:af40:93a1 not tested
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
usepa.mail.protection.outlook.com ✓
yes
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
dcns1.epa.gov ✓dcns2.epa.gov ✓nccns1.epa.gov ✓nccns2.epa.gov ✓
yes

First measured 2026-10-31; last confirmed 2026-10-31.

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
https://epa.gov/ via 2620:117:506f:15::f022 → 301https://www.epa.gov/ via 2600:9000:2305:9400:10:f3db:af40:93a1 → 200
works
 Load epa.gov over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

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

Check again

epa.gov  Has IPv6

A (IPv4)134.67.21.34
AAAA (IPv6)2620:117:506f:15::f022

www.epa.gov  Has IPv6

Alias ofd32i4z0dxazdtp.cloudfront.net
A (IPv4)18.67.76.94
18.67.76.78
18.67.76.85
18.67.76.27
AAAA (IPv6)2600:9000:2305:9400:10:f3db:af40:93a1
2600:9000:2305:e600:10:f3db:af40:93a1
2600:9000:2305:4400:10:f3db:af40:93a1
2600:9000:2305:8a00:10:f3db:af40:93a1
2600:9000:2305:a00:10:f3db:af40:93a1
2600:9000:2305:e200:10:f3db:af40:93a1
2600:9000:2305:3e00:10:f3db:af40:93a1
2600:9000:2305:e800:10:f3db:af40:93a1

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/-Sqe2FYENG · How we measure

Checked 2026-10-31 06:04:31 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/epa.gov · JSON: /api/v1/epa.gov