Yes — stanford.edu has IPv6.

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

IPv6 readiness

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

Website over IPv6 stanford.edu has an AAAA record and answers on it. ✓ 2607:f6d0:0:925a::ab43:d7c8 answers · 443	yes
www over IPv6 www.stanford.edu has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1f18:16e:df01::1f6 answers · 443✓ 2600:1f18:16e:df01::1f5 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mxa-00000d07.gslb.pphosted.com ✗mxb-00000d07.gslb.pphosted.com ✗	no
Nameservers have IPv6 6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns5.dnsmadeeasy.com ✓ns6.dnsmadeeasy.com ✓ns7.dnsmadeeasy.com ✓argus.stanford.edu ✓atalante.stanford.edu ✓avallone.stanford.edu ✓	yes

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

https://stanford.edu/ via 2607:f6d0:0:925a::ab43:d7c8 → 301https://www.stanford.edu/ via 2600:1f18:16e:df01::1f6 → 200

works

What's keeping stanford.edu from an A

Mail servers without IPv6
mxa-00000d07.gslb.pphosted.com, mxb-00000d07.gslb.pphosted.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

stanford.edu Has IPv6

A (IPv4)	171.67.215.200
AAAA (IPv6)	2607:f6d0:0:925a::ab43:d7c8

www.stanford.edu Has IPv6

Alias of	stanford.netlifyglobalcdn.com
A (IPv4)	3.33.186.135 15.197.167.90
AAAA (IPv6)	2600:1f18:16e:df01::1f6 2600:1f18:16e:df01::1f5

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: stanford.edu
Measured 2026-10-30 21:04:32 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    171.67.215.200
AAAA (IPv6): 2607:f6d0:0:925a::ab43:d7c8
www AAAA:    2600:1f18:16e:df01::1f6, 2600:1f18:16e:df01::1f5

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: stanford.edu has an AAAA record and answers on it.
    2607:f6d0:0:925a::ab43:d7c8: answers (TCP 443)
- www over IPv6: www.stanford.edu has 2 IPv6 addresses and answers on every one we tested.
    2600:1f18:16e:df01::1f6: answers (TCP 443)
    2600:1f18:16e:df01::1f5: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 6 of 6 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://stanford.edu/ via 2607:f6d0:0:925a::ab43:d7c8 -> HTTP 301, certificate: valid
    https://www.stanford.edu/ via 2600:1f18:16e:df01::1f6 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/aJRPJQnABS

Permanent link: aaaa.bot/r/aJRPJQnABS · How we measure

Checked 2026-10-30 21:04:32 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/stanford.edu · JSON: /api/v1/stanford.edu