Yes — sslip.io has IPv6.

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

C
IPv6 readiness
Works over IPv6, with gaps: www doesn't fully work over IPv6; its mail servers lack IPv6.
Website over IPv6
sslip.io has an AAAA record and answers on it.
✓ 2a01:4f8:c17:b8f::2 answers · 443
yes
www over IPv6
www.sslip.io has no AAAA record.		no
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mail.protonmail.ch ✗mailsec.protonmail.ch ✗
no
Nameservers have IPv6
3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-ovh.sslip.io ✓ns-00.nip.io ✓ns-01.nip.io ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
https://sslip.io/ via 2a01:4f8:c17:b8f::2 → 301https://nip.io/ via 2a01:4f8:c17:b8f::2 → 200
works
 Load sslip.io over IPv6 from up to six other places — a second opinion.

What's keeping sslip.io from an A

  1. Add IPv6 for www.sslip.io
    www.sslip.io has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse sslip.io's AAAA record(s) for www. How to add an AAAA record
  2. Mail servers without IPv6
    mail.protonmail.ch, mailsec.protonmail.ch 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

sslip.io  Has IPv6

A (IPv4)78.46.204.247
AAAA (IPv6)2a01:4f8:c17:b8f::2

www.sslip.io  No address

A (IPv4)none
AAAA (IPv6)none

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/OEYqKGc0z3 · How we measure

Checked 2026-10-31 13:00:38 UTC. Full DNS report: dns.pizza/domain/sslip.io · JSON: /api/v1/sslip.io