Yes — cloud.uchicago.edu has IPv6.

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

IPv6 readiness

Works over IPv6, with one gap: its nameservers lack IPv6.

Website over IPv6 cloud.uchicago.edu has an AAAA record and answers on it. ✓ 2603:1061:14:70::1 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 No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS. ucns1.uchicago.yale.edu ✗ucns1.uchicago.uiowa.edu ✗ucns3.uchicago.edu ✗ucns4.uchicago.edu ✗	no

HTTPS over IPv6 · not part of the grade yet
The certificate served over IPv6 at 2603:1061:14:70::1 isn't valid for cloud.uchicago.edu: ERR_TLS_CERT_ALTNAME_INVALID.

https://cloud.uchicago.edu/ via 2603:1061:14:70::1 · ERR_TLS_CERT_ALTNAME_INVALID

problem

What's keeping cloud.uchicago.edu from an A

The certificate served over IPv6 is wrong
The certificate served over IPv6 at 2603:1061:14:70::1 isn't valid for cloud.uchicago.edu: ERR_TLS_CERT_ALTNAME_INVALID. Often the IPv6 address points at a different server (or an old one) than IPv4 does. Make sure 2603:1061:14:70::1 serves the same certificate as your IPv4 address.
Nameservers without IPv6
ucns1.uchicago.yale.edu, ucns1.uchicago.uiowa.edu, ucns3.uchicago.edu, ucns4.uchicago.edu all have no AAAA record, so a resolver that only speaks IPv6 can't look your domain up. Most DNS providers offer IPv6 nameservers; ask yours, or move DNS to one that does.

Check again

cloud.uchicago.edu Has IPv6

Alias of	cloudservices.its.uchicago.edu → hubba882888a582-prod-frontdoor-endpoint-gkbrerhnepdbhbag.a01.azurefd.net → mr-a01.tm-azurefd.net
A (IPv4)	150.171.109.118
AAAA (IPv6)	2603:1061:14:70::1

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: cloud.uchicago.edu
Measured 2026-11-01 00:34:53 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    150.171.109.118
AAAA (IPv6): 2603:1061:14:70::1

Readiness grade B: Works over IPv6, with one gap: its nameservers lack IPv6.
- Website over IPv6: cloud.uchicago.edu has an AAAA record and answers on it.
    2603:1061:14:70::1: 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: No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): The certificate served over IPv6 at 2603:1061:14:70::1 isn't valid for cloud.uchicago.edu: ERR_TLS_CERT_ALTNAME_INVALID.
    https://cloud.uchicago.edu/ via 2603:1061:14:70::1, certificate: ERR_TLS_CERT_ALTNAME_INVALID
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/CfPEN1wD5u

Permanent link: aaaa.bot/r/CfPEN1wD5u · How we measure

Checked 2026-11-01 00:34:53 UTC. Full DNS report: dns.pizza/domain/cloud.uchicago.edu · JSON: /api/v1/cloud.uchicago.edu