Yes — www.gov.br has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
www.gov.br has an AAAA record and answers on it.
✓ 2804:151:3:2:161:148:164:31 answers · 443
yes
Mail servers (MX) have IPv6
No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.		yes
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
bsa1.serpro.gov.br ✓bsa2.serpro.gov.br ✓spo1.serpro.gov.br ✓spo2.serpro.gov.br ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://www.gov.br/ via 2804:151:3:2:161:148:164:31 → 403
works
 Load www.gov.br 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/www.gov.br.svg)](https://aaaa.bot/www.gov.br)

Check again

www.gov.br  Has IPv6

A (IPv4)161.148.164.31
AAAA (IPv6)2804:151:3:2:161:148:164:31

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/tRegLgefXt · How we measure

Checked 2026-10-31 05:04:33 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/www.gov.br · JSON: /api/v1/www.gov.br