Yes — partbook.org has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 partbook.org has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:b9ab answers · 443✓ 2606:4700:3035::6815:1352 answers · 443	yes
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. jake.ns.cloudflare.com ✓leia.ns.cloudflare.com ✓	yes

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

https://partbook.org/ via 2606:4700:3033::ac43:b9ab → 302https://falling-mouse-b451.cloudflareaccess.com/cdn-cgi/access/login/partbook.org?kid=3b1b1c539873f0fb55cb4d38cea91a887a5b2a0340b7190f2093fd86e21bd1f3&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.V9pg8noQjqIM46zJc4bagsseWuBhYJDMZX5koASESPM3Bi5exfhU8kxDTJ-bsw1FmCG-UYFVj04jiobwUifXVd8RcZ0mM5AkIewVSXZqcmYg_amkNWNAEn5uywPBkxIdT5ugYdQCBdTe9eoAgFhLfk8La68fC86E16SjmzAY96RTuZNpK39VwuZMfUHP0OiPbD3-biEF_rg1_c2rw08ZrYILNeAnFmUoLEIX-4TLacmsXqvHuzK6zvnxn6mH2D4N6CFSBqxCkS21DglGqoXdinYyZulEOBGTcGb6prIzPi4DPcNEeis16TYPCdGqy5_6zBdiRwvZwiEaXqbd0OIGEg&redirect_url=%2F via 2606:4700:300a::6813:c31d → 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/partbook.org.svg)](https://aaaa.bot/partbook.org)

Check again

partbook.org Has IPv6

A (IPv4)	172.67.185.171 104.21.19.82
AAAA (IPv6)	2606:4700:3033::ac43:b9ab 2606:4700:3035::6815:1352

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: partbook.org
Measured 2026-11-02 22:50:43 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.185.171, 104.21.19.82
AAAA (IPv6): 2606:4700:3033::ac43:b9ab, 2606:4700:3035::6815:1352

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: partbook.org has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:b9ab: answers (TCP 443)
    2606:4700:3035::6815:1352: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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 after 1 redirect: HTTP 200.
    https://partbook.org/ via 2606:4700:3033::ac43:b9ab -> HTTP 302, certificate: valid
    https://falling-mouse-b451.cloudflareaccess.com/cdn-cgi/access/login/partbook.org?kid=3b1b1c539873f0fb55cb4d38cea91a887a5b2a0340b7190f2093fd86e21bd1f3&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.V9pg8noQjqIM46zJc4bagsseWuBhYJDMZX5koASESPM3Bi5exfhU8kxDTJ-bsw1FmCG-UYFVj04jiobwUifXVd8RcZ0mM5AkIewVSXZqcmYg_amkNWNAEn5uywPBkxIdT5ugYdQCBdTe9eoAgFhLfk8La68fC86E16SjmzAY96RTuZNpK39VwuZMfUHP0OiPbD3-biEF_rg1_c2rw08ZrYILNeAnFmUoLEIX-4TLacmsXqvHuzK6zvnxn6mH2D4N6CFSBqxCkS21DglGqoXdinYyZulEOBGTcGb6prIzPi4DPcNEeis16TYPCdGqy5_6zBdiRwvZwiEaXqbd0OIGEg&redirect_url=%2F via 2606:4700:300a::6813:c31d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/n6sP7Sq8SV

Permanent link: aaaa.bot/r/n6sP7Sq8SV · How we measure

Checked 2026-11-02 22:50:43 UTC. Full DNS report: dns.pizza/domain/partbook.org · Age, certificate and blocklists: how.is/partbook.org · JSON: /api/v1/partbook.org