Find every subdomain
of a domain.

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

8 hosts · 267 ms

HostCertsFirst seenLast seen
soteriasec.com 17 2026-05-03 2026-09-17
*.soteriasec.com 9 2026-05-03 2026-09-17
client-fileshare.soteriasec.com 5 2026-06-07 2026-10-03
staging.soteriasec.com 8 2026-05-05 2026-08-31
epoch.soteriasec.com 3 2026-06-26 2026-06-29
dev-epoch.soteriasec.com 3 2026-06-20 2026-06-20
bimi.soteriasec.com 11 2026-04-18 2026-10-05
mta-sts.soteriasec.com 9 2026-05-27 2026-09-22

Programmatic access: API GET /v1/hosts/soteriasec.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/soteriasec.com.