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.

18 hosts · 347 ms

HostCertsFirst seenLast seenDNS
jsocit.com 20 2026-04-09 2026-10-04 ok
*.jsocit.com 10 2026-04-09 2026-10-04 —
panda.jsocit.com 6 2026-06-13 2026-08-29 ok
pipeline.jsocit.com 6 2026-05-27 2026-08-11 ok
stethoscope.jsocit.com 8 2026-05-10 2026-07-26 ok
crm.jsocit.com 2 2026-08-25 2026-08-25 ok
stethescope-demo.jsocit.com 3 2026-10-01 2026-10-01 ok
www.stethescope-demo.jsocit.com 1 2026-10-01 2026-10-01 ok
dossier.jsocit.com 6 2026-06-08 2026-08-23 ok
docs.jsocit.com 8 2026-05-12 2026-07-28 ok
mta-sts.jsocit.com 5 2026-05-06 2026-09-03 ok
trust.jsocit.com 14 2026-04-09 2026-10-04 ok
www.jsocit.com 6 2026-05-06 2026-09-01 ok
scopex.jsocit.com 5 2026-05-19 2026-09-18 ok
api-scopex.jsocit.com 5 2026-05-17 2026-09-14 ok
ready.jsocit.com 8 2026-04-14 2026-09-15 ok
staging-ready.jsocit.com 6 2026-07-10 2026-09-24 ok
autopsy.jsocit.com 6 2026-06-22 2026-09-06 ok

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