Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

38 hosts · 241 ms

HostCertsFirst seenLast seenDNS
nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
*.nsldsfap.ed.gov 2 2026-05-28 2026-05-28 —
mail1.nsldsfap.ed.gov 3 2026-03-16 2026-09-15 ok
mail2.nsldsfap.ed.gov 3 2026-03-16 2026-09-15 ok
mail3.nsldsfap.ed.gov 3 2026-03-16 2026-09-15 ok
mail4.nsldsfap.ed.gov 3 2026-03-16 2026-09-15 ok
*.apps.prod.nsldsfap.ed.gov 5 2026-06-04 2026-08-20 —
console.apps.prod.nsldsfap.ed.gov 5 2026-06-04 2026-08-20 nodata
oauth.apps.prod.nsldsfap.ed.gov 5 2026-06-04 2026-08-20 nodata
ssoauth.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 nxdomain
service-api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 nxdomain
user-api.nsldsfap.ed.gov 6 2025-10-15 2026-09-25 ok
service.api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
internal.api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 nxdomain
cod-internal.api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
external.api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
user.api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
service-priv.api.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
mail.nsldsfap.ed.gov 1 2026-08-10 2026-08-10 nxdomain
*.mail.nsldsfap.ed.gov 1 2026-08-10 2026-08-10 —
origin.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
service-api-origin.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 nxdomain
user-api-origin.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
nsldsops-origin.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
reports-origin.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
info.nsldsfap.ed.gov 1 2026-08-10 2026-08-10 nxdomain
*.info.nsldsfap.ed.gov 1 2026-08-10 2026-08-10 —
azkaban.app.nsldsfap.ed.gov 1 2026-01-28 2026-01-28 ok
reports.nsldsfap.ed.gov 6 2025-10-15 2026-09-25 ok
*.test.nsldsfap.ed.gov 23 2026-04-14 2026-08-20 —
nslds-web.test.nsldsfap.ed.gov 5 2025-10-15 2026-09-25 ok
nslds-system-api.test.nsldsfap.ed.gov 5 2025-10-15 2026-09-25 ok
nslds-api.test.nsldsfap.ed.gov 5 2025-10-15 2026-09-25 ok
nslds-alation.test.nsldsfap.ed.gov 5 2025-10-15 2026-09-25 ok
nslds-cognos.test.nsldsfap.ed.gov 5 2025-10-15 2026-09-25 ok
*.apps.test.nsldsfap.ed.gov 4 2026-04-13 2026-08-10 —
console-openshift-console.apps.test.nsldsfap.ed.gov 4 2026-04-13 2026-08-10 nodata
oauth-openshift.apps.test.nsldsfap.ed.gov 4 2026-04-13 2026-08-10 nodata

Programmatic access, with DNS A records: API GET /v1/hosts/nsldsfap.ed.gov (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/nsldsfap.ed.gov.