Yes — debian.org has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 debian.org has 4 IPv6 addresses and answers on every one we tested. ✓ 2a04:4e42::644 answers · 443✓ 2a04:4e42:200::644 answers · 443✓ 2a04:4e42:400::644 answers · 443✓ 2a04:4e42:600::644 answers · 443	yes
www over IPv6 www.debian.org has 2 IPv6 addresses and answers on every one we tested. ✓ 2001:67c:2564:a119::77 answers · 443✓ 2001:648:2ffc:deb:216:61ff:fe2b:6138 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. mailly.debian.org ✓muffat.debian.org ✓mitropoulos.debian.org ✓	yes
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. nsp.dnsnode.net ✓dns4.easydns.info ✓sec1.rcode0.net ✓sec2.rcode0.net ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://debian.org/ via 2a04:4e42::644 → 302https://www.debian.org/ via 2001:67c:2564:a119::77 → 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/debian.org.svg)](https://aaaa.bot/debian.org)

Check again

debian.org Has IPv6

A (IPv4)	151.101.2.132 151.101.66.132 151.101.130.132 151.101.194.132
AAAA (IPv6)	2a04:4e42::644 2a04:4e42:200::644 2a04:4e42:400::644 2a04:4e42:600::644

www.debian.org Has IPv6

A (IPv4)	140.211.166.200 194.177.211.216 128.31.0.62 130.89.148.77
AAAA (IPv6)	2001:67c:2564:a119::77 2001:648:2ffc:deb:216:61ff:fe2b:6138

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: debian.org
Measured 2026-10-31 10:04:47 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    151.101.2.132, 151.101.66.132, 151.101.130.132, 151.101.194.132
AAAA (IPv6): 2a04:4e42::644, 2a04:4e42:200::644, 2a04:4e42:400::644, 2a04:4e42:600::644
www AAAA:    2001:67c:2564:a119::77, 2001:648:2ffc:deb:216:61ff:fe2b:6138

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: debian.org has 4 IPv6 addresses and answers on every one we tested.
    2a04:4e42::644: answers (TCP 443)
    2a04:4e42:200::644: answers (TCP 443)
    2a04:4e42:400::644: answers (TCP 443)
    2a04:4e42:600::644: answers (TCP 443)
- www over IPv6: www.debian.org has 2 IPv6 addresses and answers on every one we tested.
    2001:67c:2564:a119::77: answers (TCP 443)
    2001:648:2ffc:deb:216:61ff:fe2b:6138: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 4 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 after 1 redirect: HTTP 200.
    https://debian.org/ via 2a04:4e42::644 -> HTTP 302, certificate: valid
    https://www.debian.org/ via 2001:67c:2564:a119::77 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/aVI7Lk7wPF

Permanent link: aaaa.bot/r/aVI7Lk7wPF · How we measure

Checked 2026-10-31 10:04:47 UTC. Full DNS report: dns.pizza/domain/debian.org · JSON: /api/v1/debian.org