Yes — bitdefender.com has IPv6.

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

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 bitdefender.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700::6811:9e03 answers · 443✓ 2606:4700::6811:9d03 answers · 443	yes
www over IPv6 www.bitdefender.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700::6812:1a9 answers · 443✓ 2606:4700::6812:a9 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx02.bitdefender.com ✗mx01.bitdefender.com ✗	no
Nameservers have IPv6 6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. a3-65.akam.net ✓a9-64.akam.net ✓a1-39.akam.net ✓a20-66.akam.net ✓a6-65.akam.net ✓a10-64.akam.net ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 2 redirects: HTTP 200.

https://bitdefender.com/ via 2606:4700::6811:9e03 → 301https://www.bitdefender.com/ via 2606:4700::6812:1a9 → 307https://www.bitdefender.com/en-us/ via 2606:4700::6812:1a9 → 200

works

What's keeping bitdefender.com from an A

Mail servers without IPv6
mx02.bitdefender.com, mx01.bitdefender.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

bitdefender.com Has IPv6

A (IPv4)	104.17.158.3 104.17.157.3
AAAA (IPv6)	2606:4700::6811:9e03 2606:4700::6811:9d03

www.bitdefender.com Has IPv6

A (IPv4)	104.18.0.169 104.18.1.169
AAAA (IPv6)	2606:4700::6812:1a9 2606:4700::6812:a9

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: bitdefender.com
Measured 2026-10-31 14:33:26 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.17.158.3, 104.17.157.3
AAAA (IPv6): 2606:4700::6811:9e03, 2606:4700::6811:9d03
www AAAA:    2606:4700::6812:1a9, 2606:4700::6812:a9

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: bitdefender.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700::6811:9e03: answers (TCP 443)
    2606:4700::6811:9d03: answers (TCP 443)
- www over IPv6: www.bitdefender.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700::6812:1a9: answers (TCP 443)
    2606:4700::6812:a9: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers 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 2 redirects: HTTP 200.
    https://bitdefender.com/ via 2606:4700::6811:9e03 -> HTTP 301, certificate: valid
    https://www.bitdefender.com/ via 2606:4700::6812:1a9 -> HTTP 307, certificate: valid
    https://www.bitdefender.com/en-us/ via 2606:4700::6812:1a9 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/mTdljJZfdp

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

Checked 2026-10-31 14:33:26 UTC. Full DNS report: dns.pizza/domain/bitdefender.com · JSON: /api/v1/bitdefender.com