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.

29 hosts · 345 ms

HostCertsFirst seenLast seenDNS
poet.com 2 2025-12-08 2026-05-15 ok
*.poet.com 1 2026-05-15 2026-05-15 —
auth0.poet.com 10 2026-05-01 2026-08-28 ok
owa.poet.com 3 2025-06-23 2026-07-08 ok
stanza.poet.com 4 2026-04-12 2026-08-09 ok
old.poet.com 1 2025-12-08 2025-12-08 nxdomain
savyard.poet.com 1 2025-12-08 2025-12-08 ok
truckline.poet.com 1 2025-12-03 2025-12-03 ok
remote.poet.com 3 2026-05-17 2026-08-06 ok
containerloading.poet.com 2 2026-08-27 2026-08-27 ok
devopsapi.poet.com 1 2025-12-08 2025-12-08 ok
salesforceintegrationextapi.poet.com 1 2025-12-08 2025-12-08 ok
savfum.poet.com 1 2025-12-08 2025-12-08 ok
pivision.poet.com 1 2025-12-23 2025-12-23 ok
autodiscover.poet.com 3 2025-06-23 2026-07-08 ok
sav-us-ctr.poet.com 1 2025-12-08 2025-12-08 ok
sav-us-ctr-test.poet.com 1 2025-12-08 2025-12-08 ok
savyardtest.poet.com 1 2025-12-08 2025-12-08 ok
savfumtest.poet.com 1 2025-12-08 2025-12-08 ok
dev.poet.com 1 2025-12-08 2025-12-08 ok
savyarddev.poet.com 1 2025-12-08 2025-12-08 ok
trucklinedev.poet.com 1 2025-12-03 2025-12-03 ok
containerloadingdev.poet.com 2 2026-08-27 2026-08-27 ok
devopsapidev.poet.com 1 2025-12-08 2025-12-08 ok
salesforceintegrationextapidev.poet.com 1 2025-12-08 2025-12-08 ok
savfumdev.poet.com 1 2025-12-08 2025-12-08 ok
pbptradeshowdev.poet.com 1 2025-12-08 2025-12-08 ok
pbptradeshow.poet.com 1 2025-12-08 2025-12-08 ok
www.poet.com 1 2025-12-08 2025-12-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/poet.com (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/poet.com.