Yes — avast.com has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 avast.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:392::21c7 answers · 443✓ 2600:1408:c400:38b::21c7 answers · 443	yes
www over IPv6 www.avast.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:392::21c7 answers · 443✓ 2600:1408:c400:38b::21c7 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. avast-com.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. a11-66.akam.net ✓a13-65.akam.net ✓a1-182.akam.net ✓a26-67.akam.net ✓a6-67.akam.net ✓a20-66.akam.net ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 403.

https://avast.com/ via 2600:1408:c400:392::21c7 → 301https://www.avast.com/ via 2600:1408:c400:392::21c7 → 403

works

Nothing keeping you from an A

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

Check again

avast.com Has IPv6

A (IPv4)	23.35.29.115
AAAA (IPv6)	2600:1408:c400:392::21c7 2600:1408:c400:38b::21c7

www.avast.com Has IPv6

Alias of	www.avast.com-2.edgekey.net → e8647.dsca.akamaiedge.net
A (IPv4)	23.35.29.115
AAAA (IPv6)	2600:1408:c400:392::21c7 2600:1408:c400:38b::21c7

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: avast.com
Measured 2026-10-31 04:12:03 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    23.35.29.115
AAAA (IPv6): 2600:1408:c400:392::21c7, 2600:1408:c400:38b::21c7
www AAAA:    2600:1408:c400:392::21c7, 2600:1408:c400:38b::21c7

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: avast.com has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:392::21c7: answers (TCP 443)
    2600:1408:c400:38b::21c7: answers (TCP 443)
- www over IPv6: www.avast.com has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:392::21c7: answers (TCP 443)
    2600:1408:c400:38b::21c7: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 6 of 6 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 403.
    https://avast.com/ via 2600:1408:c400:392::21c7 -> HTTP 301, certificate: valid
    https://www.avast.com/ via 2600:1408:c400:392::21c7 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/vKCJgrySVM

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

Checked 2026-10-31 04:12:03 UTC. Full DNS report: dns.pizza/domain/avast.com · JSON: /api/v1/avast.com