Yes — bitbucket.org has IPv6.

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

This is a saved measurement from 2026-11-01 11:11 UTC. Check bitbucket.org live now

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 bitbucket.org has 3 IPv6 addresses and answers on every one we tested. ✓ 2401:1d80:321c:1:0:bbc:1:df7c answers · 443✓ 2401:1d80:321c::bbc:1:df7c answers · 443✓ 2401:1d80:321c:2:0:bbc:1:df7c answers · 443	yes
www over IPv6 www.bitbucket.org has 3 IPv6 addresses and answers on every one we tested. ✓ 2401:1d80:321c:1:0:bbc:1:df7c answers · 443✓ 2401:1d80:321c:2:0:bbc:1:df7c answers · 443✓ 2401:1d80:321c::bbc:1:df7c answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mxa-001d9801.gslb.pphosted.com ✗mxb-001d9801.gslb.pphosted.com ✗	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns-1305.awsdns-35.org ✓ns-1746.awsdns-26.co.uk ✓ns-445.awsdns-55.com ✓ns-584.awsdns-09.net ✓	yes

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

https://bitbucket.org/ via 2401:1d80:321c:1:0:bbc:1:df7c → 200

works

What's keeping bitbucket.org from an A

Mail servers without IPv6
mxa-001d9801.gslb.pphosted.com, mxb-001d9801.gslb.pphosted.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

bitbucket.org Has IPv6

A (IPv4)	104.192.142.26 104.192.142.25 104.192.142.24
AAAA (IPv6)	2401:1d80:321c:1:0:bbc:1:df7c 2401:1d80:321c::bbc:1:df7c 2401:1d80:321c:2:0:bbc:1:df7c

www.bitbucket.org Has IPv6

Alias of	bitbucket.org
A (IPv4)	104.192.142.26 104.192.142.25 104.192.142.24
AAAA (IPv6)	2401:1d80:321c:1:0:bbc:1:df7c 2401:1d80:321c:2:0:bbc:1:df7c 2401:1d80:321c::bbc:1:df7c

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: bitbucket.org
Measured 2026-11-01 11:11:05 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.192.142.26, 104.192.142.25, 104.192.142.24
AAAA (IPv6): 2401:1d80:321c:1:0:bbc:1:df7c, 2401:1d80:321c::bbc:1:df7c, 2401:1d80:321c:2:0:bbc:1:df7c
www AAAA:    2401:1d80:321c:1:0:bbc:1:df7c, 2401:1d80:321c:2:0:bbc:1:df7c, 2401:1d80:321c::bbc:1:df7c

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: bitbucket.org has 3 IPv6 addresses and answers on every one we tested.
    2401:1d80:321c:1:0:bbc:1:df7c: answers (TCP 443)
    2401:1d80:321c::bbc:1:df7c: answers (TCP 443)
    2401:1d80:321c:2:0:bbc:1:df7c: answers (TCP 443)
- www over IPv6: www.bitbucket.org has 3 IPv6 addresses and answers on every one we tested.
    2401:1d80:321c:1:0:bbc:1:df7c: answers (TCP 443)
    2401:1d80:321c:2:0:bbc:1:df7c: answers (TCP 443)
    2401:1d80:321c::bbc:1:df7c: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers 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: HTTP 200.
    https://bitbucket.org/ via 2401:1d80:321c:1:0:bbc:1:df7c -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/KRKu4nfwlI

Permanent link: aaaa.bot/r/KRKu4nfwlI · How we measure

Checked 2026-11-01 11:11:05 UTC. Full DNS report: dns.pizza/domain/bitbucket.org · JSON: /api/v1/bitbucket.org