Yes — sherlok.bio has IPv6.

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

This is a saved measurement from 2026-11-02 03:18 UTC. Check sherlok.bio live now

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
sherlok.bio has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::ac43:cf72 answers · 443✓ 2606:4700:3035::6815:350c answers · 443
yes
www over IPv6
www.sherlok.bio has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3035::ac43:cf72 answers · 443✓ 2606:4700:3035::6815:350c answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mail.sherlocktg.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
igor.ns.cloudflare.com ✓ligia.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://sherlok.bio/ via 2606:4700:3035::ac43:cf72 → 200
works

What's keeping sherlok.bio from an A

  1. Mail servers without IPv6
    mail.sherlocktg.com 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.

Check again

sherlok.bio  Has IPv6

A (IPv4)104.21.53.12
172.67.207.114
AAAA (IPv6)2606:4700:3035::ac43:cf72
2606:4700:3035::6815:350c

www.sherlok.bio  Has IPv6

A (IPv4)104.21.53.12
172.67.207.114
AAAA (IPv6)2606:4700:3035::ac43:cf72
2606:4700:3035::6815:350c

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/D6E3H88TzX · How we measure

Checked 2026-11-02 03:18:15 UTC. Full DNS report: dns.pizza/domain/sherlok.bio · JSON: /api/v1/sherlok.bio