On no blocklists we checked, valid HTTPS, the site answered 200 in 70 ms.
Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

| A | 23.185.0.3 |
|---|---|
| AAAA | 2620:12a:8000::3 2620:12a:8001::3 |
| MX | 50 mx0a-00164701.pphosted.com 50 mx0b-00164701.pphosted.com |
| NS | ns0163.secondary.cloudflare.com ns0037.secondary.cloudflare.com |
| TXT | asv=1147b35e22e2230f3e7ed7ef96d0b3cb ecee88b3-e854-43c4-936d-f88a3eabc95a e2ma-verification=5gfgb e2ma-verification=f2fgb SFMC-amtHrwXeF3C5rm2Ha9E3H_dpDHSLFtemkbvrt-wI anthropic-domain-verification-x7watn=4dSAzk3nah83WVRJd29J5M2H5 pardot_137301_*=10c850f0ce73fd1f680c3edc78532b93f96e586561ff743a37eec44f63731125 apple-domain-verification=f8jvjXpxkZuZImoG atlassian-domain-verification=kSvetIKe/diM5FGbD37dFnvsdAGwPgNFtgM/1L2RoLFZeXaHp85HV/7TZ2PwsyX3 box-domain-verification=3430746f12c99e884185c424a68a8074130e28056a6c457bbe05730d945ed270 e2ma-verification=jafgb smartsheet-site-validation=TU0OtXimEUDMJsaPh9y4LAbl10IbwvYq dropbox-domain-verification=q9fk5cnf7e8z hpe-greenlake-domain-verification=4d42657379582d505849316c4355583579776d497658643764525a6372344334 google-site-verification=nojeOyc6lI8uv7PtvYD47Elxa4EAw8unfUWjovYIfOQ google-site-verification=2Z-mrJy4KQmEzVpdrZOonGhzDjNR6vC44p-NG6ks0Bw docusign=0e8d546c-c2fe-412d-be88-b3c7fc36e4e9 openai-domain-verification=dv-kGyAmC7lEvaog16maM510wic v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all google-site-verification=7jISKLgSY6Xj9zt1ZjvoVsHZvOMpGjgzih8xn6sDoXA 71MB6F28FTH9N79MPH1TN49H6E atlassian-domain-verification=oLsWbvIwAA0zKHIxnOG4nKuc6JJRY91TD/04xw1nbNohMNkiiBfaTxs8ZeneC4f6 e2ma-verification=31b 3b3ivpda2f10se3nn7olfrfucj e2ma-verification=t5egb apple-domain-verification=r8UAnaLgMQbbCPYH docusign=b64b37c7-7a9d-4b6d-9093-07e862bada10 cisco-ci-domain-verification=4c96d65a1a9921efe23d594af51d2534c089b7ac61d461b7a98cee05286f7030 e2ma-verification=vffgb amazonses:pdFwTbWzxT9aEG1QWjQIN1JQ2Nde7PSWZbDNYgLiJII= teamviewer-sso-verification=65d375c2d6374c5a991d77de3d1949a0 D14214D894D2922F41249F24F96E2A3F openai-domain-verification=dv-fHYmgZvRjNESMGRQcU8v87pq MS=ms20859340 b121225d-7ecf-4ab1-9a6c-0498793bc091 brevo-code:c8ebd56e46efa8226729d35478a57103 pardot_137301_*=65e54b29681de123cb44a1079735eb760ede531320b27768f921b2fe7a59efa0 |
| valid | yes |
|---|---|
| issuer | Let's Encrypt |
| covers | about.usc.edu, emergency.usc.edu, usc.edu, visit.usc.edu, www.usc.edu |
| protocol | TLSv1.3 |
Domain has DNSKEY but no DS record in parent zone
| SPF | pass v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all |
|---|---|
| DMARC | warning policy none |
| DKIM | found: selector1, s1, s2, mail |
Whether mail claiming to be from this domain can be checked as genuine.
Green: clean. Red: listed. Grey: the list did not answer.
Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.
MCP: add https://how.is/mcp to Claude, Codex or Cursor
(one-line install) and ask for domain_trust on usc.edu.
Reference: /llms.txt.
IPv6. Does usc.edu work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.
Watch usc.edu. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.
Watch — $1 / 30 days