Yes — spor.istanbul has IPv6.

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

This is a saved measurement from 2026-11-04 23:07 UTC. Check spor.istanbul live now

IPv6 readiness

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

Website over IPv6 spor.istanbul has 3 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:20::681a:bf3 answers · 443✓ 2606:4700:20::681a:af3 answers · 443✓ 2606:4700:20::ac43:49f0 answers · 443	yes
www over IPv6 www.spor.istanbul has 3 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:20::681a:af3 answers · 443✓ 2606:4700:20::ac43:49f0 answers · 443✓ 2606:4700:20::681a:bf3 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mail.verimerkezi.istanbul ✗mail1.verimerkezi.istanbul ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. kristin.ns.cloudflare.com ✓reese.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.

https://spor.istanbul/ via 2606:4700:20::681a:bf3 → 403

works

What's keeping spor.istanbul from an A

Mail servers without IPv6
mail.verimerkezi.istanbul, mail1.verimerkezi.istanbul 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

spor.istanbul Has IPv6

A (IPv4)	104.26.11.243 104.26.10.243 172.67.73.240
AAAA (IPv6)	2606:4700:20::681a:bf3 2606:4700:20::681a:af3 2606:4700:20::ac43:49f0

www.spor.istanbul Has IPv6

A (IPv4)	104.26.10.243 104.26.11.243 172.67.73.240
AAAA (IPv6)	2606:4700:20::681a:af3 2606:4700:20::ac43:49f0 2606:4700:20::681a:bf3

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: spor.istanbul
Measured 2026-11-04 23:07:25 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.26.11.243, 104.26.10.243, 172.67.73.240
AAAA (IPv6): 2606:4700:20::681a:bf3, 2606:4700:20::681a:af3, 2606:4700:20::ac43:49f0
www AAAA:    2606:4700:20::681a:af3, 2606:4700:20::ac43:49f0, 2606:4700:20::681a:bf3

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: spor.istanbul has 3 IPv6 addresses and answers on every one we tested.
    2606:4700:20::681a:bf3: answers (TCP 443)
    2606:4700:20::681a:af3: answers (TCP 443)
    2606:4700:20::ac43:49f0: answers (TCP 443)
- www over IPv6: www.spor.istanbul has 3 IPv6 addresses and answers on every one we tested.
    2606:4700:20::681a:af3: answers (TCP 443)
    2606:4700:20::ac43:49f0: answers (TCP 443)
    2606:4700:20::681a:bf3: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 2 of 2 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: HTTP 403.
    https://spor.istanbul/ via 2606:4700:20::681a:bf3 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/XAYsBYYB1h

Permanent link: aaaa.bot/r/XAYsBYYB1h · How we measure

Checked 2026-11-04 23:07:25 UTC. Full DNS report: dns.pizza/domain/spor.istanbul · Age, certificate and blocklists: how.is/spor.istanbul · JSON: /api/v1/spor.istanbul