Yes — slackline.fun has IPv6.

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

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
slackline.fun has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3032::ac43:b460 answers · 443✓ 2606:4700:3034::6815:122c answers · 443
yes
www over IPv6
www.slackline.fun has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700:3034::6815:122c answers · 443✓ 2606:4700:3032::ac43:b460 answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx1.hosting.reg.ru ✗mx2.hosting.reg.ru ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
saanvi.ns.cloudflare.com ✓walt.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 200.
https://slackline.fun/ via 2606:4700:3032::ac43:b460 → 200
works
 Load slackline.fun over IPv6 from up to six other places — a second opinion.

What's keeping slackline.fun from an A

  1. Mail servers without IPv6
    mx1.hosting.reg.ru, mx2.hosting.reg.ru 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

slackline.fun  Has IPv6

A (IPv4)172.67.180.96
104.21.18.44
AAAA (IPv6)2606:4700:3032::ac43:b460
2606:4700:3034::6815:122c

www.slackline.fun  Has IPv6

A (IPv4)172.67.180.96
104.21.18.44
AAAA (IPv6)2606:4700:3034::6815:122c
2606:4700:3032::ac43:b460

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/G0h6z-Bq_V · How we measure

Checked 2026-11-02 10:35:12 UTC. Full DNS report: dns.pizza/domain/slackline.fun · JSON: /api/v1/slackline.fun