Yes — uol.com.br has IPv6.

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

This is a saved measurement from 2026-10-30 23:04 UTC. Check uol.com.br live now

C
IPv6 readiness
Works over IPv6, with gaps: its mail servers lack IPv6; its nameservers lack IPv6.
Website over IPv6
uol.com.br has an AAAA record and answers on it.
✓ 2804:49c:3102:401:ffff:ffff:ffff:36 answers · 443
yes
www over IPv6
www.uol.com.br has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
✓ 2600:9000:201d:ca00:1:5a19:8b40:93a1 answers · 443✓ 2600:9000:201d:a000:1:5a19:8b40:93a1 answers · 443✓ 2600:9000:201d:0:1:5a19:8b40:93a1 answers · 443✓ 2600:9000:201d:7000:1:5a19:8b40:93a1 answers · 443– 2600:9000:201d:5400:1:5a19:8b40:93a1 not tested– 2600:9000:201d:f200:1:5a19:8b40:93a1 not tested– 2600:9000:201d:9600:1:5a19:8b40:93a1 not tested– 2600:9000:201d:7c00:1:5a19:8b40:93a1 not tested
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx.uol.com.br ✗
no
Nameservers have IPv6
No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.
eliot.uol.com.br ✗borges.uol.com.br ✗charles.uol.com.br ✗
no
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
https://uol.com.br/ via 2804:49c:3102:401:ffff:ffff:ffff:36 → 301https://www.uol.com.br/ via 2600:9000:201d:ca00:1:5a19:8b40:93a1 → 200
works

What's keeping uol.com.br from an A

  1. Mail servers without IPv6
    mx.uol.com.br 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.
  2. Nameservers without IPv6
    eliot.uol.com.br, borges.uol.com.br, charles.uol.com.br all have no AAAA record, so a resolver that only speaks IPv6 can't look your domain up. Most DNS providers offer IPv6 nameservers; ask yours, or move DNS to one that does.

Check again

uol.com.br  Has IPv6

A (IPv4)200.147.35.149
AAAA (IPv6)2804:49c:3102:401:ffff:ffff:ffff:36

www.uol.com.br  Has IPv6

Alias ofdftex7xfha8fh.cloudfront.net
A (IPv4)13.226.209.87
13.226.209.86
13.226.209.28
13.226.209.42
AAAA (IPv6)2600:9000:201d:ca00:1:5a19:8b40:93a1
2600:9000:201d:a000:1:5a19:8b40:93a1
2600:9000:201d:0:1:5a19:8b40:93a1
2600:9000:201d:7000:1:5a19:8b40:93a1
2600:9000:201d:5400:1:5a19:8b40:93a1
2600:9000:201d:f200:1:5a19:8b40:93a1
2600:9000:201d:9600:1:5a19:8b40:93a1
2600:9000:201d:7c00:1:5a19:8b40:93a1

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/khfqlwxUhT · How we measure

Checked 2026-10-30 23:04:38 UTC. Full DNS report: dns.pizza/domain/uol.com.br · JSON: /api/v1/uol.com.br