imap.eonet.ne.jp publishes IPv6 but doesn't answer on it.

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

F
IPv6 readiness
Publishes IPv6 but doesn't answer on it — worse than having none.
Website over IPv6
imap.eonet.ne.jp has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4.
✗ 2001:240:bb81:94:202:238:198:25 no answer
broken
Mail servers (MX) have IPv6
No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.		yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns1.eonet.ne.jp ✓ns7.eonet.ne.jp ✓
yes
 Which outside scripts, fonts, payments or chat imap.eonet.ne.jp loads from have no IPv6.
 Load imap.eonet.ne.jp over IPv6 from up to six other places — a second opinion.

What's keeping imap.eonet.ne.jp from an A

  1. Fix or remove the AAAA record for imap.eonet.ne.jp
    Something published an IPv6 address but nothing answers on it, so IPv6 visitors wait for a timeout first. Either make the server listen on IPv6 (and allow ports 443/80 through its firewall), or delete the AAAA record until it does.

Check again

imap.eonet.ne.jp  Has IPv6

Alias ofkopt-eonet-imap.xspmail.jp
A (IPv4)202.238.198.25
AAAA (IPv6)2001:240:bb81:94:202:238:198:25

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/od1bPxWhyc · How we measure

Checked 2026-11-15 18:04:17 UTC. Full DNS report: dns.pizza/domain/imap.eonet.ne.jp · Age, certificate and blocklists: how.is/imap.eonet.ne.jp · JSON: /api/v1/imap.eonet.ne.jp