Yes — compresslab.org has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 compresslab.org has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::ac43:8e60 answers · 443✓ 2606:4700:3034::6815:4f3a answers · 443	yes
www over IPv6 www.compresslab.org has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3034::6815:4f3a answers · 443✓ 2606:4700:3031::ac43:8e60 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. route3.mx.cloudflare.net ✓route2.mx.cloudflare.net ✓route1.mx.cloudflare.net ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. cortney.ns.cloudflare.com ✓scott.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.

https://compresslab.org/ via 2606:4700:3031::ac43:8e60 → 200

works

Nothing keeping you from an A

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

Check again

compresslab.org Has IPv6

A (IPv4)	104.21.79.58 172.67.142.96
AAAA (IPv6)	2606:4700:3031::ac43:8e60 2606:4700:3034::6815:4f3a

www.compresslab.org Has IPv6

A (IPv4)	172.67.142.96 104.21.79.58
AAAA (IPv6)	2606:4700:3034::6815:4f3a 2606:4700:3031::ac43:8e60

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: compresslab.org
Measured 2026-11-05 07:39:31 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.79.58, 172.67.142.96
AAAA (IPv6): 2606:4700:3031::ac43:8e60, 2606:4700:3034::6815:4f3a
www AAAA:    2606:4700:3034::6815:4f3a, 2606:4700:3031::ac43:8e60

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: compresslab.org has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::ac43:8e60: answers (TCP 443)
    2606:4700:3034::6815:4f3a: answers (TCP 443)
- www over IPv6: www.compresslab.org has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3034::6815:4f3a: answers (TCP 443)
    2606:4700:3031::ac43:8e60: 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 200.
    https://compresslab.org/ via 2606:4700:3031::ac43:8e60 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/9qSMZqr2Hp

Permanent link: aaaa.bot/r/9qSMZqr2Hp · How we measure

Checked 2026-11-05 07:39:31 UTC. Full DNS report: dns.pizza/domain/compresslab.org · Age, certificate and blocklists: how.is/compresslab.org · JSON: /api/v1/compresslab.org