Yes — ithencheck.tech has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 ithencheck.tech has an AAAA record and answers on it. ✓ 2a02:4780:59:8777::1 answers · 443	yes
www over IPv6 www.ithencheck.tech has an AAAA record and answers on it. ✓ 2a02:4780:59:8777::1 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. ithencheck.tech ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. cosmos.dns-parking.com ✓nova.dns-parking.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Answered over IPv6 with a server error (HTTP 503) — can't tell whether that's specific to IPv6.

https://ithencheck.tech/ via 2a02:4780:59:8777::1 → 503

Nothing keeping you from an A

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

Check again

ithencheck.tech Has IPv6

A (IPv4)	187.77.121.51
AAAA (IPv6)	2a02:4780:59:8777::1

www.ithencheck.tech Has IPv6

Alias of	ithencheck.tech
A (IPv4)	187.77.121.51
AAAA (IPv6)	2a02:4780:59:8777::1

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: ithencheck.tech
Measured 2026-11-05 08:10:30 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    187.77.121.51
AAAA (IPv6): 2a02:4780:59:8777::1
www AAAA:    2a02:4780:59:8777::1

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: ithencheck.tech has an AAAA record and answers on it.
    2a02:4780:59:8777::1: answers (TCP 443)
- www over IPv6: www.ithencheck.tech has an AAAA record and answers on it.
    2a02:4780:59:8777::1: 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): Answered over IPv6 with a server error (HTTP 503) — can't tell whether that's specific to IPv6.
    https://ithencheck.tech/ via 2a02:4780:59:8777::1 -> HTTP 503, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/0Y6hnxLtu5

Permanent link: aaaa.bot/r/0Y6hnxLtu5 · How we measure

Checked 2026-11-05 08:10:30 UTC. Full DNS report: dns.pizza/domain/ithencheck.tech · Age, certificate and blocklists: how.is/ithencheck.tech · JSON: /api/v1/ithencheck.tech