Yes — jamanetwork.com has IPv6.

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

This is a saved measurement from 2026-10-31 14:07 UTC. Check jamanetwork.com live now

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
jamanetwork.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700::6812:db3 answers · 443✓ 2606:4700::6812:cb3 answers · 443
yes
www over IPv6
www.jamanetwork.com has an AAAA record and answers on it.
✓ 2603:1030:20c:9::2e1 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mxb-00164a01.gslb.pphosted.com ✗mxa-00164a01.gslb.pphosted.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
pdns12.domaincontrol.com ✓pdns11.domaincontrol.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://jamanetwork.com/ via 2606:4700::6812:db3 → 403
works

What's keeping jamanetwork.com from an A

  1. Mail servers without IPv6
    mxb-00164a01.gslb.pphosted.com, mxa-00164a01.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

jamanetwork.com  Has IPv6

A (IPv4)104.18.13.179
104.18.12.179
AAAA (IPv6)2606:4700::6812:db3
2606:4700::6812:cb3

www.jamanetwork.com  Has IPv6

A (IPv4)40.76.153.40
AAAA (IPv6)2603:1030:20c:9::2e1

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/y20KLZ1kYU · How we measure

Checked 2026-10-31 14:07:03 UTC. Full DNS report: dns.pizza/domain/jamanetwork.com · JSON: /api/v1/jamanetwork.com