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.

15 hosts · 390 ms

HostCertsFirst seenLast seenDNS
thecompanystore.com 5 2026-01-28 2026-08-10 ok
swasc.thecompanystore.com 1 2026-03-16 2026-03-16 ok
trk.send.thecompanystore.com 13 2026-06-05 2026-10-01 ok
staging.thecompanystore.com 6 2026-01-28 2026-08-10 ok
mi.thecompanystore.com 2 2025-06-13 2026-05-14 ok
svopn.thecompanystore.com 3 2025-12-12 2026-09-17 ok
*.svopn.thecompanystore.com 1 2025-12-12 2025-12-12 —
refer.thecompanystore.com 5 2026-05-06 2026-09-01 ok
metrics.thecompanystore.com 2 2026-07-01 2026-07-01 ok
connect.thecompanystore.com 2 2026-04-07 2026-09-07 ok
api-connect.thecompanystore.com 2 2026-04-07 2026-09-07 ok
development.thecompanystore.com 6 2026-01-28 2026-08-10 ok
sv.thecompanystore.com 6 2026-03-30 2026-09-14 ok
www.thecompanystore.com 5 2026-01-28 2026-08-10 ok
fxyvcz.thecompanystore.com 3 2026-05-02 2026-09-08 ok

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