Yes — tandfonline.com has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
tandfonline.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:4401::ac40:9485 answers · 443✓ 2a06:98c1:310a::6812:277b answers · 443
yes
www over IPv6
www.tandfonline.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:4401::ac40:9485 answers · 443✓ 2a06:98c1:310a::6812:277b answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
us-smtp-inbound-1.mimecast.com ✗us-smtp-inbound-2.mimecast.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
lee.ns.cloudflare.com ✓rachel.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://tandfonline.com/ via 2606:4700:4401::ac40:9485 → 403
works
 Load tandfonline.com over IPv6 from up to six other places — a second opinion.

What's keeping tandfonline.com from an A

  1. Mail servers without IPv6
    us-smtp-inbound-1.mimecast.com, us-smtp-inbound-2.mimecast.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

tandfonline.com  Has IPv6

A (IPv4)172.64.148.133
104.18.39.123
AAAA (IPv6)2606:4700:4401::ac40:9485
2a06:98c1:310a::6812:277b

www.tandfonline.com  Has IPv6

A (IPv4)172.64.148.133
104.18.39.123
AAAA (IPv6)2606:4700:4401::ac40:9485
2a06:98c1:310a::6812:277b

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/rnDSLWfJxK · How we measure

Checked 2026-10-31 08:36:07 UTC. Full DNS report: dns.pizza/domain/tandfonline.com · JSON: /api/v1/tandfonline.com