Yes — servecal.org has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 servecal.org has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:5112 answers · 443✓ 2606:4700:3030::ac43:897e answers · 443	yes
www over IPv6 www.servecal.org has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::ac43:897e answers · 443✓ 2606:4700:3033::6815:5112 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. brit.ns.cloudflare.com ✓sterling.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://servecal.org/ via 2606:4700:3033::6815:5112 → 302https://gpersonal.cloudflareaccess.com/cdn-cgi/access/login/servecal.org?kid=0a1d5ce9768274efca2085f85db573b4c2b0aa13866588bc03c0a32209d6b92b&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjM5OTJiYWVmY2IxMGJlOThhMjRlNGY4ZDZkYTcxMjRkMzc5YzI5MzJhOTJhNGM3NmQ5ZTRiMGI4YTAyZGEzYTYifQ.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.gZ4eCpwH-_0G0ojk8mmwwBSooh0s5CmvwoTyNPSsUJVOt-V868Pfg7A6S66IP2Ucq49lYiJ1vvmRO5CwNdtzYfSf1dtZl7EhBRT_dA1OBUhC0LnU_IdPPdVw9d_XDpcU8C-XBSKbc7WxRXUFLIPDJhAd6C31W7ddIngvgpn9P2BvZ0bF26LYQrAWixVFKswlkCzA_RU8_lK_2I_a5BFv5mazrRj_eB3sUedog1ZNik3W49IilTTTKV8oMQS9JcRAZ-T4t3GKx8piw-bpn1yUWskT-ytaRzYbJ5Gr9_ssGU_Vs6A-XTYfSsRAt_GhUxXMDL3Ap6Oj9v8NmLO6_ruULg&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/servecal.org.svg)](https://aaaa.bot/servecal.org)

Check again

servecal.org Has IPv6

A (IPv4)	104.21.81.18 172.67.137.126
AAAA (IPv6)	2606:4700:3033::6815:5112 2606:4700:3030::ac43:897e

www.servecal.org Has IPv6

A (IPv4)	172.67.137.126 104.21.81.18
AAAA (IPv6)	2606:4700:3030::ac43:897e 2606:4700:3033::6815:5112

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: servecal.org
Measured 2026-11-11 10:59:14 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.81.18, 172.67.137.126
AAAA (IPv6): 2606:4700:3033::6815:5112, 2606:4700:3030::ac43:897e
www AAAA:    2606:4700:3030::ac43:897e, 2606:4700:3033::6815:5112

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: servecal.org has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:5112: answers (TCP 443)
    2606:4700:3030::ac43:897e: answers (TCP 443)
- www over IPv6: www.servecal.org has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::ac43:897e: answers (TCP 443)
    2606:4700:3033::6815:5112: 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 after 1 redirect: HTTP 200.
    https://servecal.org/ via 2606:4700:3033::6815:5112 -> HTTP 302, certificate: valid
    https://gpersonal.cloudflareaccess.com/cdn-cgi/access/login/servecal.org?kid=0a1d5ce9768274efca2085f85db573b4c2b0aa13866588bc03c0a32209d6b92b&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjM5OTJiYWVmY2IxMGJlOThhMjRlNGY4ZDZkYTcxMjRkMzc5YzI5MzJhOTJhNGM3NmQ5ZTRiMGI4YTAyZGEzYTYifQ.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.gZ4eCpwH-_0G0ojk8mmwwBSooh0s5CmvwoTyNPSsUJVOt-V868Pfg7A6S66IP2Ucq49lYiJ1vvmRO5CwNdtzYfSf1dtZl7EhBRT_dA1OBUhC0LnU_IdPPdVw9d_XDpcU8C-XBSKbc7WxRXUFLIPDJhAd6C31W7ddIngvgpn9P2BvZ0bF26LYQrAWixVFKswlkCzA_RU8_lK_2I_a5BFv5mazrRj_eB3sUedog1ZNik3W49IilTTTKV8oMQS9JcRAZ-T4t3GKx8piw-bpn1yUWskT-ytaRzYbJ5Gr9_ssGU_Vs6A-XTYfSsRAt_GhUxXMDL3Ap6Oj9v8NmLO6_ruULg&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/Vrhh6yqnpz

Permanent link: aaaa.bot/r/Vrhh6yqnpz · How we measure

Checked 2026-11-11 10:59:14 UTC. Full DNS report: dns.pizza/domain/servecal.org · Age, certificate and blocklists: how.is/servecal.org · JSON: /api/v1/servecal.org