Yes — www2.census.gov has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: www doesn't fully work over IPv6.
Website over IPv6
www2.census.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.www2.census.gov has no AAAA record.		no
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
3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
blue.foundationdns.com ✓blue.foundationdns.net ✓blue.foundationdns.org ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://www2.census.gov/ via 2606:4700:78::90:0:180 → 200
works
 Load www2.census.gov over IPv6 from up to six other places — a second opinion.

What's keeping www2.census.gov from an A

  1. Add IPv6 for www.www2.census.gov
    www.www2.census.gov has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse www2.census.gov's AAAA record(s) for www. How to add an AAAA record

Check again

www2.census.gov  Has IPv6

A (IPv4)172.65.90.27
172.65.90.24
172.65.90.25
172.65.90.26
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.www2.census.gov  No address

A (IPv4)none
AAAA (IPv6)none

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/kEJ42fFEYj · How we measure

Checked 2026-11-02 06:20:33 UTC. Full DNS report: dns.pizza/domain/www2.census.gov · JSON: /api/v1/www2.census.gov