Yes — yahoo.com 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 yahoo.com has 4 IPv6 addresses and answers on every one we tested (2 more not tested). ✓ 2001:4998:124:1507::f000 answers · 443✓ 2001:4998:44:3507::8001 answers · 443✓ 2001:4998:124:1507::f001 answers · 443✓ 2001:4998:24:120d::1:1 answers · 443– 2001:4998:24:120d::1:0 not tested– 2001:4998:44:3507::8000 not tested	yes
www over IPv6 www.yahoo.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2001:4998:14:800::1001 answers · 443✓ 2001:4998:14:800::1000 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mta5.am0.yahoodns.net ✗mta7.am0.yahoodns.net ✗mta6.am0.yahoodns.net ✗	no
Nameservers have IPv6 4 of 5 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns4.yahoo.com ✗ns3.yahoo.com ✓ns2.yahoo.com ✓ns5.yahoo.com ✓ns1.yahoo.com ✓	yes

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

https://yahoo.com/ via 2001:4998:124:1507::f000 → 301https://www.yahoo.com/ via 2001:4998:14:800::1001 → 200

works

What's keeping yahoo.com from an A

Mail servers without IPv6
mta5.am0.yahoodns.net, mta7.am0.yahoodns.net, mta6.am0.yahoodns.net 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

yahoo.com Has IPv6

A (IPv4)	74.6.231.21 98.137.11.163 98.137.11.164 74.6.143.25 74.6.143.26 74.6.231.20
AAAA (IPv6)	2001:4998:124:1507::f000 2001:4998:44:3507::8001 2001:4998:124:1507::f001 2001:4998:24:120d::1:1 2001:4998:24:120d::1:0 2001:4998:44:3507::8000

www.yahoo.com Has IPv6

Alias of	me-ycpi-cf-www.g06.yahoodns.net
A (IPv4)	69.147.92.12 69.147.92.11
AAAA (IPv6)	2001:4998:14:800::1001 2001:4998:14:800::1000

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: yahoo.com
Measured 2026-10-30 19:45:18 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    74.6.231.21, 98.137.11.163, 98.137.11.164, 74.6.143.25, 74.6.143.26, 74.6.231.20
AAAA (IPv6): 2001:4998:124:1507::f000, 2001:4998:44:3507::8001, 2001:4998:124:1507::f001, 2001:4998:24:120d::1:1, 2001:4998:24:120d::1:0, 2001:4998:44:3507::8000
www AAAA:    2001:4998:14:800::1001, 2001:4998:14:800::1000

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: yahoo.com has 4 IPv6 addresses and answers on every one we tested (2 more not tested).
    2001:4998:124:1507::f000: answers (TCP 443)
    2001:4998:44:3507::8001: answers (TCP 443)
    2001:4998:124:1507::f001: answers (TCP 443)
    2001:4998:24:120d::1:1: answers (TCP 443)
    2001:4998:24:120d::1:0: not tested
    2001:4998:44:3507::8000: not tested
- www over IPv6: www.yahoo.com has 2 IPv6 addresses and answers on every one we tested.
    2001:4998:14:800::1001: answers (TCP 443)
    2001:4998:14:800::1000: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 4 of 5 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://yahoo.com/ via 2001:4998:124:1507::f000 -> HTTP 301, certificate: valid
    https://www.yahoo.com/ via 2001:4998:14:800::1001 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/6n6D1zFezu

Permanent link: aaaa.bot/r/6n6D1zFezu · How we measure

Checked 2026-10-30 19:45:18 UTC. Full DNS report: dns.pizza/domain/yahoo.com · JSON: /api/v1/yahoo.com