Yes — appspot.com has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 appspot.com has 4 IPv6 addresses and answers on every one we tested. ✓ 2607:f8b0:4004:c27::64 answers · 443✓ 2607:f8b0:4004:c27::8a answers · 443✓ 2607:f8b0:4004:c27::65 answers · 443✓ 2607:f8b0:4004:c27::71 answers · 443	yes
www over IPv6 www.appspot.com has 4 IPv6 addresses and answers on every one we tested. ✓ 2607:f8b0:4004:c23::65 answers · 443✓ 2607:f8b0:4004:c23::64 answers · 443✓ 2607:f8b0:4004:c23::66 answers · 443✓ 2607:f8b0:4004:c23::71 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 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns3.google.com ✓ns1.google.com ✓ns4.google.com ✓ns2.google.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 3 redirects: HTTP 200.

https://appspot.com/ via 2607:f8b0:4004:c27::64 → 302https://console.cloud.google.com/appengine via 2607:f8b0:4004:c17::65 → 302https://accounts.google.com/ServiceLogin?service=cloudconsole&passive=1209600&osid=1&continue=https://console.cloud.google.com/appengine&followup=https://console.cloud.google.com/appengine via 2607:f8b0:4004:c07::54 → 302https://accounts.google.com/v3/signin/identifier?continue=https://console.cloud.google.com/appengine&followup=https://console.cloud.google.com/appengine&osid=1&passive=1209600&service=cloudconsole&flowName=WebLiteSignIn&flowEntry=ServiceLogin&dsh=S17033013:1793423072810549 via 2607:f8b0:4004:c07::54 → 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/appspot.com.svg)](https://aaaa.bot/appspot.com)

Check again

appspot.com Has IPv6

A (IPv4)	142.251.163.113 142.251.163.138 142.251.163.101 142.251.163.100 142.251.163.102 142.251.163.139
AAAA (IPv6)	2607:f8b0:4004:c27::64 2607:f8b0:4004:c27::8a 2607:f8b0:4004:c27::65 2607:f8b0:4004:c27::71

www.appspot.com Has IPv6

A (IPv4)	172.253.115.139 172.253.115.138 172.253.115.100 172.253.115.113 172.253.115.101 172.253.115.102
AAAA (IPv6)	2607:f8b0:4004:c23::65 2607:f8b0:4004:c23::64 2607:f8b0:4004:c23::66 2607:f8b0:4004:c23::71

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: appspot.com
Measured 2026-10-31 05:04:32 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    142.251.163.113, 142.251.163.138, 142.251.163.101, 142.251.163.100, 142.251.163.102, 142.251.163.139
AAAA (IPv6): 2607:f8b0:4004:c27::64, 2607:f8b0:4004:c27::8a, 2607:f8b0:4004:c27::65, 2607:f8b0:4004:c27::71
www AAAA:    2607:f8b0:4004:c23::65, 2607:f8b0:4004:c23::64, 2607:f8b0:4004:c23::66, 2607:f8b0:4004:c23::71

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: appspot.com has 4 IPv6 addresses and answers on every one we tested.
    2607:f8b0:4004:c27::64: answers (TCP 443)
    2607:f8b0:4004:c27::8a: answers (TCP 443)
    2607:f8b0:4004:c27::65: answers (TCP 443)
    2607:f8b0:4004:c27::71: answers (TCP 443)
- www over IPv6: www.appspot.com has 4 IPv6 addresses and answers on every one we tested.
    2607:f8b0:4004:c23::65: answers (TCP 443)
    2607:f8b0:4004:c23::64: answers (TCP 443)
    2607:f8b0:4004:c23::66: answers (TCP 443)
    2607:f8b0:4004:c23::71: 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: 4 of 4 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 3 redirects: HTTP 200.
    https://appspot.com/ via 2607:f8b0:4004:c27::64 -> HTTP 302, certificate: valid
    https://console.cloud.google.com/appengine via 2607:f8b0:4004:c17::65 -> HTTP 302, certificate: valid
    https://accounts.google.com/ServiceLogin?service=cloudconsole&passive=1209600&osid=1&continue=https://console.cloud.google.com/appengine&followup=https://console.cloud.google.com/appengine via 2607:f8b0:4004:c07::54 -> HTTP 302, certificate: valid
    https://accounts.google.com/v3/signin/identifier?continue=https://console.cloud.google.com/appengine&followup=https://console.cloud.google.com/appengine&osid=1&passive=1209600&service=cloudconsole&flowName=WebLiteSignIn&flowEntry=ServiceLogin&dsh=S17033013:1793423072810549 via 2607:f8b0:4004:c07::54 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/DYAfAqaHy4

Permanent link: aaaa.bot/r/DYAfAqaHy4 · How we measure

Checked 2026-10-31 05:04:32 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/appspot.com · JSON: /api/v1/appspot.com