Yes — portal.census.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
portal.census.gov has an AAAA record and answers on it.
✓ 2610:20:2010:a05:1000:0:9481:4bc3 answers · 443
yes
www over IPv6
www.portal.census.gov has an AAAA record and answers on it.
✓ 2610:20:2010:a05:1000:0:9481:4bc3 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
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns1e.census.gov ✓ns2e.census.gov ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://portal.census.gov/ via 2610:20:2010:a05:1000:0:9481:4bc3 → 200
works
 Load portal.census.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/portal.census.gov.svg)](https://aaaa.bot/portal.census.gov)

Check again

portal.census.gov  Has IPv6

A (IPv4)148.129.75.206
AAAA (IPv6)2610:20:2010:a05:1000:0:9481:4bc3

www.portal.census.gov  Has IPv6

Alias ofportal.census.gov
A (IPv4)148.129.75.206
AAAA (IPv6)2610:20:2010:a05:1000:0:9481:4bc3

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/5ZqpNZXu_k · How we measure

Checked 2026-11-02 05:41:10 UTC. Full DNS report: dns.pizza/domain/portal.census.gov · JSON: /api/v1/portal.census.gov