Yes — autoconfig.nethost.cz has IPv6.

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

This is a saved measurement from 2026-11-07 03:01 UTC. Check autoconfig.nethost.cz live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 autoconfig.nethost.cz has an AAAA record and answers on it. ✓ 2a00:1ed0:46:200::1213:56 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. server85.viwefix.cz ✓	yes
Nameservers have IPv6 3 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. dns.nethost.cz ✓pns.nethost.cz ✗sns.nethost.sk ✓tns.nethost.eu ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.

https://autoconfig.nethost.cz/ via 2a00:1ed0:46:200::1213:56 → 403

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/autoconfig.nethost.cz.svg)](https://aaaa.bot/autoconfig.nethost.cz)

Check again

autoconfig.nethost.cz Has IPv6

Alias of	server85.viwefix.cz
A (IPv4)	217.16.182.49
AAAA (IPv6)	2a00:1ed0:46:200::1213:56

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

IPv6 measurement: autoconfig.nethost.cz
Measured 2026-11-07 03:01:22 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    217.16.182.49
AAAA (IPv6): 2a00:1ed0:46:200::1213:56

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: autoconfig.nethost.cz has an AAAA record and answers on it.
    2a00:1ed0:46:200::1213:56: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 3 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): Loads over IPv6 with a valid certificate: HTTP 403.
    https://autoconfig.nethost.cz/ via 2a00:1ed0:46:200::1213:56 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/-iXC35rVic

Permanent link: aaaa.bot/r/-iXC35rVic · How we measure

Checked 2026-11-07 03:01:22 UTC. Full DNS report: dns.pizza/domain/autoconfig.nethost.cz · Age, certificate and blocklists: how.is/autoconfig.nethost.cz · JSON: /api/v1/autoconfig.nethost.cz