Yes — chatqpt.app has IPv6.

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

IPv6 readiness

Works over IPv6, with one gap: www doesn't fully work over IPv6.

Website over IPv6 chatqpt.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::ac43:a89c answers · 443✓ 2606:4700:3031::6815:1af0 answers · 443	yes
www over IPv6 www.chatqpt.app has no AAAA record.	no
Mail servers (MX) have IPv6 Every mail server has an AAAA record. route2.mx.cloudflare.net ✓route1.mx.cloudflare.net ✓route3.mx.cloudflare.net ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. lars.ns.cloudflare.com ✓vivienne.ns.cloudflare.com ✓	yes

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

https://chatqpt.app/ via 2606:4700:3030::ac43:a89c → 302https://chatqpt.cloudflareaccess.com/cdn-cgi/access/login/chatqpt.app?kid=e67e2e446e2ee20fe6882f91bdb2295de21c339499dc8aabd5a6228e82154934&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjM2NDBhYWJiNjViYzU5MDJlNjk3MmM3ODNhOTE1Mjc4ZmI2YTQxZmEzOTc3MzM3YTAwNTk2ZDEzNTJhZDI3MGYifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6ImU2N2UyZTQ0NmUyZWUyMGZlNjg4MmY5MWJkYjIyOTVkZTIxYzMzOTQ5OWRjOGFhYmQ1YTYyMjhlODIxNTQ5MzQiLCJob3N0bmFtZSI6ImNoYXRxcHQuYXBwIiwicmVkaXJlY3RfdXJsIjoiLyIsInNlcnZpY2VfdG9rZW5fc3RhdHVzIjpmYWxzZSwiaXNfd2FycCI6ZmFsc2UsImlzX2dhdGV3YXkiOmZhbHNlLCJleHAiOjE3OTQyNzY1NzUsIm5iZiI6MTc5NDI3NjI3NSwiaWF0IjoxNzk0Mjc2Mjc1LCJhdXRoX3N0YXR1cyI6Ik5PTkUiLCJtdGxzX2F1dGgiOnsiY2VydF9pc3N1ZXJfZG4iOiIiLCJjZXJ0X3NlcmlhbCI6IiIsImNlcnRfaXNzdWVyX3NraSI6IiIsImNlcnRfcHJlc2VudGVkIjpmYWxzZSwiY29tbW9uX25hbWUiOiIiLCJhdXRoX3N0YXR1cyI6Ik5PTkUifSwicmVhbF9jb3VudHJ5IjoiVVMiLCJhcHBfc2Vzc2lvbl9oYXNoIjoiMjE2YWY5MzIxMzU0NjVhYWFkNTMzNjJmYWE2MGM2N2VlYWJlYzMxZDc4YmVlNjZhZDZmNzY3YWEzMDM2ZDI2YyJ9.RifoMnRMOhrwrHUMuKsOHvq_H4eactFFJl2OOKZNXDBtNzcsVxfD-ZaGEFNl_8RmFISOcV6_9EHgbRya7ecV6GxV9j9npDHonZYFYL5t4GFvkFin7qvkNAjD8My8pnPUROlYBL-iYPFjiOnKg12mFgY5jb2jU1z4EB8Y9rdiTxGU8cUg8mJgaHEzF8FXeH92fZQSdsF10qNaz2GH3dFtZxNSrCxPhtzN8Eltf8b9LB7OrbzxUwugB8Rei_tOxzQ84jkmVCRaHqssDC9FTWsTgYwnEvWc_zlE2DUF6eF8Ka9pcXX_SWqMCNV8anAOzP3lHTu9RIyokCDdeQLgCj2EiA&redirect_url=%2F via 2606:4700:300a::6813:c21d → 200

works

What's keeping chatqpt.app from an A

www.chatqpt.app is an alias of parking.d.parity.domains, which has no IPv6
www.chatqpt.app is a CNAME, so it can't also have its own AAAA record. Ask whoever runs parking.d.parity.domains to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6

Check again

chatqpt.app Has IPv6

A (IPv4)	104.21.26.240 172.67.168.156
AAAA (IPv6)	2606:4700:3030::ac43:a89c 2606:4700:3031::6815:1af0

www.chatqpt.app IPv4 only

Alias of	parkingpage.namecheap.com → parking.d.parity.domains
A (IPv4)	2.59.170.19 104.219.250.36
AAAA (IPv6)	none

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: chatqpt.app
Measured 2026-11-10 02:04:35 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.26.240, 172.67.168.156
AAAA (IPv6): 2606:4700:3030::ac43:a89c, 2606:4700:3031::6815:1af0
www AAAA:    none

Readiness grade B: Works over IPv6, with one gap: www doesn't fully work over IPv6.
- Website over IPv6: chatqpt.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::ac43:a89c: answers (TCP 443)
    2606:4700:3031::6815:1af0: answers (TCP 443)
- www over IPv6: www.chatqpt.app has no AAAA record.
- Mail servers (MX) have IPv6: Every mail server 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://chatqpt.app/ via 2606:4700:3030::ac43:a89c -> HTTP 302, certificate: valid
    https://chatqpt.cloudflareaccess.com/cdn-cgi/access/login/chatqpt.app?kid=e67e2e446e2ee20fe6882f91bdb2295de21c339499dc8aabd5a6228e82154934&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjM2NDBhYWJiNjViYzU5MDJlNjk3MmM3ODNhOTE1Mjc4ZmI2YTQxZmEzOTc3MzM3YTAwNTk2ZDEzNTJhZDI3MGYifQ.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.RifoMnRMOhrwrHUMuKsOHvq_H4eactFFJl2OOKZNXDBtNzcsVxfD-ZaGEFNl_8RmFISOcV6_9EHgbRya7ecV6GxV9j9npDHonZYFYL5t4GFvkFin7qvkNAjD8My8pnPUROlYBL-iYPFjiOnKg12mFgY5jb2jU1z4EB8Y9rdiTxGU8cUg8mJgaHEzF8FXeH92fZQSdsF10qNaz2GH3dFtZxNSrCxPhtzN8Eltf8b9LB7OrbzxUwugB8Rei_tOxzQ84jkmVCRaHqssDC9FTWsTgYwnEvWc_zlE2DUF6eF8Ka9pcXX_SWqMCNV8anAOzP3lHTu9RIyokCDdeQLgCj2EiA&redirect_url=%2F via 2606:4700:300a::6813:c21d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/YudgZtn_dy

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

Checked 2026-11-10 02:04:35 UTC. Full DNS report: dns.pizza/domain/chatqpt.app · Age, certificate and blocklists: how.is/chatqpt.app · JSON: /api/v1/chatqpt.app