Yes — serpup.app has IPv6.

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

This is a saved measurement from 2026-11-09 15:02 UTC. Check serpup.app live now

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
serpup.app has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::ac43:9589 answers · 443✓ 2606:4700:3031::6815:1da9 answers · 443
yes
www over IPv6
www.serpup.app has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::ac43:9589 answers · 443✓ 2606:4700:3031::6815:1da9 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mail.serpup.app ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
burt.ns.cloudflare.com ✓lola.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://serpup.app/ via 2606:4700:3035::ac43:9589 → 200
works

What's keeping serpup.app from an A

  1. Mail servers without IPv6
    mail.serpup.app has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

serpup.app  Has IPv6

A (IPv4)172.67.149.137
104.21.29.169
AAAA (IPv6)2606:4700:3035::ac43:9589
2606:4700:3031::6815:1da9

www.serpup.app  Has IPv6

A (IPv4)104.21.29.169
172.67.149.137
AAAA (IPv6)2606:4700:3035::ac43:9589
2606:4700:3031::6815:1da9

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

 Permanent link: aaaa.bot/r/VO5iXrmqaP · How we measure

Checked 2026-11-09 15:02:46 UTC. Full DNS report: dns.pizza/domain/serpup.app · Age, certificate and blocklists: how.is/serpup.app · JSON: /api/v1/serpup.app