Yes — mrc4u.site has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 mrc4u.site has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::ac43:907e answers · 443✓ 2606:4700:3035::6815:4770 answers · 443	yes
www over IPv6 www.mrc4u.site has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3035::6815:4770 answers · 443✓ 2606:4700:3030::ac43:907e 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. garret.ns.cloudflare.com ✓tani.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Answered over IPv6 with a server error (HTTP 525) — can't tell whether that's specific to IPv6.

https://mrc4u.site/ via 2606:4700:3030::ac43:907e → 525

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/mrc4u.site.svg)](https://aaaa.bot/mrc4u.site)

Check again

mrc4u.site Has IPv6

A (IPv4)	172.67.144.126 104.21.71.112
AAAA (IPv6)	2606:4700:3030::ac43:907e 2606:4700:3035::6815:4770

www.mrc4u.site Has IPv6

A (IPv4)	172.67.144.126 104.21.71.112
AAAA (IPv6)	2606:4700:3035::6815:4770 2606:4700:3030::ac43:907e

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: mrc4u.site
Measured 2026-11-01 14:37:38 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.144.126, 104.21.71.112
AAAA (IPv6): 2606:4700:3030::ac43:907e, 2606:4700:3035::6815:4770
www AAAA:    2606:4700:3035::6815:4770, 2606:4700:3030::ac43:907e

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: mrc4u.site has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::ac43:907e: answers (TCP 443)
    2606:4700:3035::6815:4770: answers (TCP 443)
- www over IPv6: www.mrc4u.site has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3035::6815:4770: answers (TCP 443)
    2606:4700:3030::ac43:907e: 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): Answered over IPv6 with a server error (HTTP 525) — can't tell whether that's specific to IPv6.
    https://mrc4u.site/ via 2606:4700:3030::ac43:907e -> HTTP 525, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/L3OvdvlZQU

Permanent link: aaaa.bot/r/L3OvdvlZQU · How we measure

Checked 2026-11-01 14:37:38 UTC. Full DNS report: dns.pizza/domain/mrc4u.site · JSON: /api/v1/mrc4u.site