Yes — mail.active.domains has IPv6.

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

Measured 2026-11-10 17:40 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check mail.active.domains now

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
mail.active.domains has an AAAA record and answers on it.
✓ 2a02:6b8::a4 answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
mx.yandex.ru ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ben.ns.cloudflare.com ✓zara.ns.cloudflare.com ✓
yes

First measured 2026-11-10; last confirmed 2026-11-10.

HTTPS over IPv6 · not part of the grade yet
The certificate served over IPv6 at 2a02:6b8::a4 isn't valid for mail.active.domains: ERR_TLS_CERT_ALTNAME_INVALID.
https://mail.active.domains/ via 2a02:6b8::a4 · ERR_TLS_CERT_ALTNAME_INVALID
problem
 Which outside scripts, fonts, payments or chat mail.active.domains loads from have no IPv6.
 Load mail.active.domains over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

  1. The certificate served over IPv6 is wrong
    The certificate served over IPv6 at 2a02:6b8::a4 isn't valid for mail.active.domains: ERR_TLS_CERT_ALTNAME_INVALID. Often the IPv6 address points at a different server (or an old one) than IPv4 does. Make sure 2a02:6b8::a4 serves the same certificate as your IPv4 address.

Check again

mail.active.domains  Has IPv6

Alias ofdomain.mail.yandex.net → mail.yandex.ru
A (IPv4)77.88.21.37
AAAA (IPv6)2a02:6b8::a4

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/gmVmKLMyp- · How we measure

Checked 2026-11-10 17:40:50 UTC. Full DNS report: dns.pizza/domain/mail.active.domains · Age, certificate and blocklists: how.is/mail.active.domains · JSON: /api/v1/mail.active.domains