Yes — walkthru.build 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
walkthru.build has 2 IPv6 addresses and answers on every one we tested.
✓ 2600:1f18:16e:df01::259 answers · 443✓ 2600:1f18:16e:df01::258 answers · 443
yes
www over IPv6
www.walkthru.build has 2 IPv6 addresses and answers on every one we tested.
✓ 2600:1f18:16e:df01::259 answers · 443✓ 2600:1f18:16e:df01::258 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
receive.forge.rmta.net ✗
no
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
dns1.p03.nsone.net ✓dns2.p03.nsone.net ✓dns3.p03.nsone.net ✓dns4.p03.nsone.net ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://walkthru.build/ via 2600:1f18:16e:df01::259 → 200
works
 Load walkthru.build over IPv6 from up to six other places — a second opinion.

What's keeping walkthru.build from an A

  1. Mail servers without IPv6
    receive.forge.rmta.net has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

walkthru.build  Has IPv6

A (IPv4)98.84.224.111
18.208.88.157
AAAA (IPv6)2600:1f18:16e:df01::259
2600:1f18:16e:df01::258

www.walkthru.build  Has IPv6

A (IPv4)98.84.224.111
18.208.88.157
AAAA (IPv6)2600:1f18:16e:df01::259
2600:1f18:16e:df01::258

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/thXmvEIDae · How we measure

Checked 2026-11-05 15:54:54 UTC. Full DNS report: dns.pizza/domain/walkthru.build · Age, certificate and blocklists: how.is/walkthru.build · JSON: /api/v1/walkthru.build