Yes — knightcode.online has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 knightcode.online has 2 IPv6 addresses and answers on every one we tested. ✓ 2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4 answers · 443✓ 2a02:4780:84:68cf:1822:f85a:1930:ceea answers · 443	yes
www over IPv6 www.knightcode.online has 2 IPv6 addresses and answers on every one we tested. ✓ 2a02:4780:84:3228:386e:4bb6:a753:5c20 answers · 443✓ 2a02:4780:84:1bd4:ad5e:9f0a:fc8f:c53a answers · 443	yes
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. nebula.dns-parking.com ✓aurora.dns-parking.com ✓	yes

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

https://knightcode.online/ via 2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4 → 307https://knightcode.online/login via 2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4 → 200

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/knightcode.online.svg)](https://aaaa.bot/knightcode.online)

Check again

knightcode.online Has IPv6

A (IPv4)	2.57.91.6 84.32.84.174
AAAA (IPv6)	2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4 2a02:4780:84:68cf:1822:f85a:1930:ceea

www.knightcode.online Has IPv6

Alias of	www.knightcode.online.cdn.hstgr.net
A (IPv4)	2.57.91.177 84.32.84.169
AAAA (IPv6)	2a02:4780:84:3228:386e:4bb6:a753:5c20 2a02:4780:84:1bd4:ad5e:9f0a:fc8f:c53a

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: knightcode.online
Measured 2026-11-11 11:56:07 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    2.57.91.6, 84.32.84.174
AAAA (IPv6): 2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4, 2a02:4780:84:68cf:1822:f85a:1930:ceea
www AAAA:    2a02:4780:84:3228:386e:4bb6:a753:5c20, 2a02:4780:84:1bd4:ad5e:9f0a:fc8f:c53a

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: knightcode.online has 2 IPv6 addresses and answers on every one we tested.
    2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4: answers (TCP 443)
    2a02:4780:84:68cf:1822:f85a:1930:ceea: answers (TCP 443)
- www over IPv6: www.knightcode.online has 2 IPv6 addresses and answers on every one we tested.
    2a02:4780:84:3228:386e:4bb6:a753:5c20: answers (TCP 443)
    2a02:4780:84:1bd4:ad5e:9f0a:fc8f:c53a: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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 after 1 redirect: HTTP 200.
    https://knightcode.online/ via 2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4 -> HTTP 307, certificate: valid
    https://knightcode.online/login via 2a02:4780:84:e9bf:941d:70fd:a1b6:7fc4 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/IcPWq_37tD

Permanent link: aaaa.bot/r/IcPWq_37tD · How we measure

Checked 2026-11-11 11:56:07 UTC. Full DNS report: dns.pizza/domain/knightcode.online · Age, certificate and blocklists: how.is/knightcode.online · JSON: /api/v1/knightcode.online