Yes — nova.cz has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 nova.cz has 2 IPv6 addresses and answers on every one we tested. ✓ 2a06:98c1:3102::ac40:9641 answers · 443✓ 2a06:98c1:3103::6812:25bf answers · 443	yes
www over IPv6 www.nova.cz has 2 IPv6 addresses and answers on every one we tested. ✓ 2a06:98c1:3102::ac40:9641 answers · 443✓ 2a06:98c1:3103::6812:25bf answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. nova-cz.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. jason.ns.cloudflare.com ✓dorthy.ns.cloudflare.com ✓	yes

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

https://nova.cz/ via 2a06:98c1:3102::ac40:9641 → 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/nova.cz.svg)](https://aaaa.bot/nova.cz)

Check again

nova.cz Has IPv6

A (IPv4)	104.18.37.191 172.64.150.65
AAAA (IPv6)	2a06:98c1:3102::ac40:9641 2a06:98c1:3103::6812:25bf

www.nova.cz Has IPv6

A (IPv4)	104.18.37.191 172.64.150.65
AAAA (IPv6)	2a06:98c1:3102::ac40:9641 2a06:98c1:3103::6812:25bf

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: nova.cz
Measured 2026-11-05 16:00:34 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.18.37.191, 172.64.150.65
AAAA (IPv6): 2a06:98c1:3102::ac40:9641, 2a06:98c1:3103::6812:25bf
www AAAA:    2a06:98c1:3102::ac40:9641, 2a06:98c1:3103::6812:25bf

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: nova.cz has 2 IPv6 addresses and answers on every one we tested.
    2a06:98c1:3102::ac40:9641: answers (TCP 443)
    2a06:98c1:3103::6812:25bf: answers (TCP 443)
- www over IPv6: www.nova.cz has 2 IPv6 addresses and answers on every one we tested.
    2a06:98c1:3102::ac40:9641: answers (TCP 443)
    2a06:98c1:3103::6812:25bf: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 2 of 2 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://nova.cz/ via 2a06:98c1:3102::ac40:9641 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/BP5H1C2H5l

Permanent link: aaaa.bot/r/BP5H1C2H5l · How we measure

Checked 2026-11-05 16:00:34 UTC. Full DNS report: dns.pizza/domain/nova.cz · Age, certificate and blocklists: how.is/nova.cz · JSON: /api/v1/nova.cz