Yes — assets.oreilly.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
assets.oreilly.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2600:1408:c400:1f::17d4:fbc5 answers · 443✓ 2600:1408:c400:1f::17d4:fbd9 answers · 443
yes
Mail servers (MX) have IPv6
No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.		yes
Nameservers have IPv6
6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
a4-64.akam.net ✓a13-64.akam.net ✓a1-225.akam.net ✓a20-66.akam.net ✓a16-65.akam.net ✓a3-67.akam.net ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://assets.oreilly.com/ via 2600:1408:c400:1f::17d4:fbc5 → 403
works
 Load assets.oreilly.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/assets.oreilly.com.svg)](https://aaaa.bot/assets.oreilly.com)

Check again

assets.oreilly.com  Has IPv6

Alias ofsubs.oreilly.com.edgekey.net → e83935.dscb.akamaiedge.net
A (IPv4)23.205.106.83
23.205.106.74
AAAA (IPv6)2600:1408:c400:1f::17d4:fbc5
2600:1408:c400:1f::17d4:fbd9

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/b_dWHqPNoD · How we measure

Checked 2026-11-01 12:16:31 UTC. Full DNS report: dns.pizza/domain/assets.oreilly.com · JSON: /api/v1/assets.oreilly.com