Yes — justice.gov has IPv6.

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

This is a saved measurement from 2026-11-01 22:04 UTC. Check justice.gov live now

IPv6 readiness

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

Website over IPv6 justice.gov has 4 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:78::90:0:180 answers · 443✓ 2606:4700:78::90:0:181 answers · 443✓ 2606:4700:78::90:0:182 answers · 443✓ 2606:4700:78::90:0:183 answers · 443	yes
www over IPv6 www.justice.gov has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:f8b::1dae answers · 443✓ 2600:1408:c400:f80::1dae answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mxa-00a6fb01.gslb.gpphosted.com ✗mxb-00a6fb01.gslb.gpphosted.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. jonah.ns.cloudflare.com ✓novalee.ns.cloudflare.com ✓	yes

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

https://justice.gov/ via 2606:4700:78::90:0:180 → 301https://www.justice.gov/ via 2600:1408:c400:f8b::1dae → 200

works

What's keeping justice.gov from an A

Mail servers without IPv6
mxa-00a6fb01.gslb.gpphosted.com, mxb-00a6fb01.gslb.gpphosted.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

justice.gov Has IPv6

A (IPv4)	172.65.90.24 172.65.90.25 172.65.90.26 172.65.90.27
AAAA (IPv6)	2606:4700:78::90:0:180 2606:4700:78::90:0:181 2606:4700:78::90:0:182 2606:4700:78::90:0:183

www.justice.gov Has IPv6

Alias of	www.justice.gov.edgekey.net → e7598.dscb.akamaiedge.net
A (IPv4)	104.86.83.167
AAAA (IPv6)	2600:1408:c400:f8b::1dae 2600:1408:c400:f80::1dae

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: justice.gov
Measured 2026-11-01 22:04:36 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.65.90.24, 172.65.90.25, 172.65.90.26, 172.65.90.27
AAAA (IPv6): 2606:4700:78::90:0:180, 2606:4700:78::90:0:181, 2606:4700:78::90:0:182, 2606:4700:78::90:0:183
www AAAA:    2600:1408:c400:f8b::1dae, 2600:1408:c400:f80::1dae

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: justice.gov has 4 IPv6 addresses and answers on every one we tested.
    2606:4700:78::90:0:180: answers (TCP 443)
    2606:4700:78::90:0:181: answers (TCP 443)
    2606:4700:78::90:0:182: answers (TCP 443)
    2606:4700:78::90:0:183: answers (TCP 443)
- www over IPv6: www.justice.gov has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:f8b::1dae: answers (TCP 443)
    2600:1408:c400:f80::1dae: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 2 of 2 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://justice.gov/ via 2606:4700:78::90:0:180 -> HTTP 301, certificate: valid
    https://www.justice.gov/ via 2600:1408:c400:f8b::1dae -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/SgUd-5bwPr

Permanent link: aaaa.bot/r/SgUd-5bwPr · How we measure

Checked 2026-11-01 22:04:36 UTC. Full DNS report: dns.pizza/domain/justice.gov · JSON: /api/v1/justice.gov