Yes — geobox.cloud has IPv6.

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

IPv6 readiness

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

Website over IPv6 geobox.cloud has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3034::ac43:c7ca answers · 443✓ 2606:4700:3031::6815:15b7 answers · 443	yes
www over IPv6 www.geobox.cloud has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3034::ac43:c7ca answers · 443✓ 2606:4700:3031::6815:15b7 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mail.protonmail.ch ✗mailsec.protonmail.ch ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. coraline.ns.cloudflare.com ✓sergi.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://geobox.cloud/ via 2606:4700:3034::ac43:c7ca → 302https://geobox.cloud/signin?next=%2F via 2606:4700:3034::ac43:c7ca → 200

works

What's keeping geobox.cloud from an A

Mail servers without IPv6
mail.protonmail.ch, mailsec.protonmail.ch 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

geobox.cloud Has IPv6

A (IPv4)	104.21.21.183 172.67.199.202
AAAA (IPv6)	2606:4700:3034::ac43:c7ca 2606:4700:3031::6815:15b7

www.geobox.cloud Has IPv6

A (IPv4)	104.21.21.183 172.67.199.202
AAAA (IPv6)	2606:4700:3034::ac43:c7ca 2606:4700:3031::6815:15b7

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: geobox.cloud
Measured 2026-11-11 02:59:35 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.21.183, 172.67.199.202
AAAA (IPv6): 2606:4700:3034::ac43:c7ca, 2606:4700:3031::6815:15b7
www AAAA:    2606:4700:3034::ac43:c7ca, 2606:4700:3031::6815:15b7

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: geobox.cloud has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3034::ac43:c7ca: answers (TCP 443)
    2606:4700:3031::6815:15b7: answers (TCP 443)
- www over IPv6: www.geobox.cloud has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3034::ac43:c7ca: answers (TCP 443)
    2606:4700:3031::6815:15b7: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers 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://geobox.cloud/ via 2606:4700:3034::ac43:c7ca -> HTTP 302, certificate: valid
    https://geobox.cloud/signin?next=%2F via 2606:4700:3034::ac43:c7ca -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/DvxcfpPMqD

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

Checked 2026-11-11 02:59:35 UTC. Full DNS report: dns.pizza/domain/geobox.cloud · Age, certificate and blocklists: how.is/geobox.cloud · JSON: /api/v1/geobox.cloud