Yes — anthropic.com has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
anthropic.com has an AAAA record and answers on it.
✓ 2607:6bc0::10 answers · 443
yes
www over IPv6
www.anthropic.com has an AAAA record and answers on it.
✓ 2607:6bc0::10 answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
isla.ns.cloudflare.com ✓randy.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://anthropic.com/ via 2607:6bc0::10 → 301https://www.anthropic.com/ via 2607:6bc0::10 → 200
works
 Load anthropic.com 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/anthropic.com.svg)](https://aaaa.bot/anthropic.com)

Check again

anthropic.com  Has IPv6

A (IPv4)160.79.104.10
AAAA (IPv6)2607:6bc0::10

www.anthropic.com  Has IPv6

A (IPv4)160.79.104.10
AAAA (IPv6)2607:6bc0::10

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/5bTM2tA5JV · How we measure

Checked 2026-10-30 20:04:33 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/anthropic.com · JSON: /api/v1/anthropic.com