Yes — run.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 run.app has 4 IPv6 addresses and answers on every one we tested. ✓ 2001:4860:4802:32::35 answers · 443✓ 2001:4860:4802:34::35 answers · 443✓ 2001:4860:4802:38::35 answers · 443✓ 2001:4860:4802:36::35 answers · 443	yes
www over IPv6 www.run.app has 4 IPv6 addresses and answers on every one we tested (4 more not tested). ✓ 2600:1900:4243:200:: answers · 443✓ 2600:1900:4245:200:: answers · 443✓ 2600:1900:4240:200:: answers · 443✓ 2600:1900:4242:200:: answers · 443– 2600:1901:81d4:200:: not tested– 2600:1900:4241:200:: not tested– 2600:1900:4244:200:: not tested– 2600:1901:81d5:200:: not tested	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. ns2.google.com ✓ns4.google.com ✓ns3.google.com ✓ns1.google.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 404.

https://run.app/ via 2001:4860:4802:32::35 → 404

works

Nothing keeping you from an A

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

Check again

run.app Has IPv6

A (IPv4)	216.239.36.53 216.239.32.53 216.239.38.53 216.239.34.53
AAAA (IPv6)	2001:4860:4802:32::35 2001:4860:4802:34::35 2001:4860:4802:38::35 2001:4860:4802:36::35

www.run.app Has IPv6

A (IPv4)	34.143.73.2 34.143.74.2 34.143.72.2 34.143.76.2 34.143.79.2 34.143.77.2 34.143.78.2 34.143.75.2
AAAA (IPv6)	2600:1900:4243:200:: 2600:1900:4245:200:: 2600:1900:4240:200:: 2600:1900:4242:200:: 2600:1901:81d4:200:: 2600:1900:4241:200:: 2600:1900:4244:200:: 2600:1901:81d5:200::

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: run.app
Measured 2026-10-30 22:04:35 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    216.239.36.53, 216.239.32.53, 216.239.38.53, 216.239.34.53
AAAA (IPv6): 2001:4860:4802:32::35, 2001:4860:4802:34::35, 2001:4860:4802:38::35, 2001:4860:4802:36::35
www AAAA:    2600:1900:4243:200::, 2600:1900:4245:200::, 2600:1900:4240:200::, 2600:1900:4242:200::, 2600:1901:81d4:200::, 2600:1900:4241:200::, 2600:1900:4244:200::, 2600:1901:81d5:200::

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: run.app has 4 IPv6 addresses and answers on every one we tested.
    2001:4860:4802:32::35: answers (TCP 443)
    2001:4860:4802:34::35: answers (TCP 443)
    2001:4860:4802:38::35: answers (TCP 443)
    2001:4860:4802:36::35: answers (TCP 443)
- www over IPv6: www.run.app has 4 IPv6 addresses and answers on every one we tested (4 more not tested).
    2600:1900:4243:200::: answers (TCP 443)
    2600:1900:4245:200::: answers (TCP 443)
    2600:1900:4240:200::: answers (TCP 443)
    2600:1900:4242:200::: answers (TCP 443)
    2600:1901:81d4:200::: not tested
    2600:1900:4241:200::: not tested
    2600:1900:4244:200::: not tested
    2600:1901:81d5:200::: not tested
- 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: HTTP 404.
    https://run.app/ via 2001:4860:4802:32::35 -> HTTP 404, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/8tiW18sSdQ

Permanent link: aaaa.bot/r/8tiW18sSdQ · How we measure

Checked 2026-10-30 22:04:35 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/run.app · JSON: /api/v1/run.app