Yes — websupport.sk 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 websupport.sk has 3 IPv6 addresses and answers on every one we tested. ✓ 2a00:4b40:1000:4:37:9:169:171 answers · 443✓ 2a00:4b40:1000:4:37:9:169:172 answers · 443✓ 2a00:4b40:1000:4:37:9:169:173 answers · 443	yes
www over IPv6 www.websupport.sk has 3 IPv6 addresses and answers on every one we tested. ✓ 2a00:4b40:1000:4:37:9:169:171 answers · 443✓ 2a00:4b40:1000:4:37:9:169:172 answers · 443✓ 2a00:4b40:1000:4:37:9:169:173 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mailin1.websupport.sk ✗mailin2.websupport.sk ✗	no
Nameservers have IPv6 3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns1.websupport.sk ✓ns2.websupport.sk ✓ns3.websupport.sk ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://websupport.sk/ via 2a00:4b40:1000:4:37:9:169:171 → 301https://www.websupport.sk/ via 2a00:4b40:1000:4:37:9:169:171 → 200

works

What's keeping websupport.sk from an A

Mail servers without IPv6
mailin1.websupport.sk, mailin2.websupport.sk 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

websupport.sk Has IPv6

A (IPv4)	37.9.169.171 37.9.169.172 37.9.169.173
AAAA (IPv6)	2a00:4b40:1000:4:37:9:169:171 2a00:4b40:1000:4:37:9:169:172 2a00:4b40:1000:4:37:9:169:173

www.websupport.sk Has IPv6

Alias of	web.prod.bts.websupport.sk
A (IPv4)	37.9.169.171 37.9.169.172 37.9.169.173
AAAA (IPv6)	2a00:4b40:1000:4:37:9:169:171 2a00:4b40:1000:4:37:9:169:172 2a00:4b40:1000:4:37:9:169:173

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: websupport.sk
Measured 2026-11-02 12:43:53 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    37.9.169.171, 37.9.169.172, 37.9.169.173
AAAA (IPv6): 2a00:4b40:1000:4:37:9:169:171, 2a00:4b40:1000:4:37:9:169:172, 2a00:4b40:1000:4:37:9:169:173
www AAAA:    2a00:4b40:1000:4:37:9:169:171, 2a00:4b40:1000:4:37:9:169:172, 2a00:4b40:1000:4:37:9:169:173

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: websupport.sk has 3 IPv6 addresses and answers on every one we tested.
    2a00:4b40:1000:4:37:9:169:171: answers (TCP 443)
    2a00:4b40:1000:4:37:9:169:172: answers (TCP 443)
    2a00:4b40:1000:4:37:9:169:173: answers (TCP 443)
- www over IPv6: www.websupport.sk has 3 IPv6 addresses and answers on every one we tested.
    2a00:4b40:1000:4:37:9:169:171: answers (TCP 443)
    2a00:4b40:1000:4:37:9:169:172: answers (TCP 443)
    2a00:4b40:1000:4:37:9:169:173: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 3 of 3 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 200.
    https://websupport.sk/ via 2a00:4b40:1000:4:37:9:169:171 -> HTTP 301, certificate: valid
    https://www.websupport.sk/ via 2a00:4b40:1000:4:37:9:169:171 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/sh-5tgUu_Z

Permanent link: aaaa.bot/r/sh-5tgUu_Z · How we measure

Checked 2026-11-02 12:43:53 UTC. Full DNS report: dns.pizza/domain/websupport.sk · JSON: /api/v1/websupport.sk