Yes — ui.com has IPv6.

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

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
ui.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:250b:fa00:1c:894d:51c0:93a1 answers · 443✓ 2600:9000:250b:3e00:1c:894d:51c0:93a1 answers · 443✓ 2600:9000:250b:c000:1c:894d:51c0:93a1 answers · 443✓ 2600:9000:250b:fc00:1c:894d:51c0:93a1 answers · 443– 2600:9000:250b:2600:1c:894d:51c0:93a1 not tested– 2600:9000:250b:2000:1c:894d:51c0:93a1 not tested– 2600:9000:250b:da00:1c:894d:51c0:93a1 not tested– 2600:9000:250b:4800:1c:894d:51c0:93a1 not tested
yes
www over IPv6
www.ui.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:250b:e400:1c:894d:51c0:93a1 answers · 443✓ 2600:9000:250b:9800:1c:894d:51c0:93a1 answers · 443✓ 2600:9000:250b:9400:1c:894d:51c0:93a1 answers · 443✓ 2600:9000:250b:2a00:1c:894d:51c0:93a1 answers · 443– 2600:9000:250b:6a00:1c:894d:51c0:93a1 not tested– 2600:9000:250b:e600:1c:894d:51c0:93a1 not tested– 2600:9000:250b:4800:1c:894d:51c0:93a1 not tested– 2600:9000:250b:3000:1c:894d:51c0:93a1 not tested
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
aspmx.l.google.com ✓aspmx2.googlemail.com ✓aspmx3.googlemail.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓
yes
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-1469.awsdns-55.org ✓ns-1849.awsdns-39.co.uk ✓ns-277.awsdns-34.com ✓ns-656.awsdns-18.net ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://ui.com/ via 2600:9000:250b:fa00:1c:894d:51c0:93a1 → 200
works
 Load ui.com over IPv6 from up to six other places — a second opinion.

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/ui.com.svg)](https://aaaa.bot/ui.com)

Check again

ui.com  Has IPv6

A (IPv4)18.160.18.49
18.160.18.80
18.160.18.25
18.160.18.40
AAAA (IPv6)2600:9000:250b:fa00:1c:894d:51c0:93a1
2600:9000:250b:3e00:1c:894d:51c0:93a1
2600:9000:250b:c000:1c:894d:51c0:93a1
2600:9000:250b:fc00:1c:894d:51c0:93a1
2600:9000:250b:2600:1c:894d:51c0:93a1
2600:9000:250b:2000:1c:894d:51c0:93a1
2600:9000:250b:da00:1c:894d:51c0:93a1
2600:9000:250b:4800:1c:894d:51c0:93a1

www.ui.com  Has IPv6

A (IPv4)18.160.18.25
18.160.18.40
18.160.18.80
18.160.18.49
AAAA (IPv6)2600:9000:250b:e400:1c:894d:51c0:93a1
2600:9000:250b:9800:1c:894d:51c0:93a1
2600:9000:250b:9400:1c:894d:51c0:93a1
2600:9000:250b:2a00:1c:894d:51c0:93a1
2600:9000:250b:6a00:1c:894d:51c0:93a1
2600:9000:250b:e600:1c:894d:51c0:93a1
2600:9000:250b:4800:1c:894d:51c0:93a1
2600:9000:250b:3000:1c:894d:51c0:93a1

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/kgDyj-9vcq · How we measure

Checked 2026-10-30 20:25:18 UTC. Full DNS report: dns.pizza/domain/ui.com · JSON: /api/v1/ui.com