Yes — usc.edu has IPv6.

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

Measured 2026-11-02 16:56 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check usc.edu now

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 usc.edu has 2 IPv6 addresses and answers on every one we tested. ✓ 2620:12a:8000::3 answers · 443✓ 2620:12a:8001::3 answers · 443	yes
www over IPv6 www.usc.edu has 2 IPv6 addresses and answers on every one we tested. ✓ 2620:12a:8001::3 answers · 443✓ 2620:12a:8000::3 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx0a-00164701.pphosted.com ✗mx0b-00164701.pphosted.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns0163.secondary.cloudflare.com ✓ns0037.secondary.cloudflare.com ✓	yes

First measured 2026-11-02; last confirmed 2026-11-02.

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

https://usc.edu/ via 2620:12a:8000::3 → 200

works

What's keeping usc.edu from an A

Mail servers without IPv6
mx0a-00164701.pphosted.com, mx0b-00164701.pphosted.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

usc.edu Has IPv6

A (IPv4)	23.185.0.3
AAAA (IPv6)	2620:12a:8000::3 2620:12a:8001::3

www.usc.edu Has IPv6

A (IPv4)	23.185.0.3
AAAA (IPv6)	2620:12a:8001::3 2620:12a:8000::3

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: usc.edu
Measured 2026-11-02 16:56:42 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    23.185.0.3
AAAA (IPv6): 2620:12a:8000::3, 2620:12a:8001::3
www AAAA:    2620:12a:8001::3, 2620:12a:8000::3

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: usc.edu has 2 IPv6 addresses and answers on every one we tested.
    2620:12a:8000::3: answers (TCP 443)
    2620:12a:8001::3: answers (TCP 443)
- www over IPv6: www.usc.edu has 2 IPv6 addresses and answers on every one we tested.
    2620:12a:8001::3: answers (TCP 443)
    2620:12a:8000::3: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers 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: HTTP 200.
    https://usc.edu/ via 2620:12a:8000::3 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/dfzcmkfrae

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

Checked 2026-11-02 16:56:42 UTC. Full DNS report: dns.pizza/domain/usc.edu · Age, certificate and blocklists: how.is/usc.edu · JSON: /api/v1/usc.edu