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.

6 hosts · 293 ms

HostCertsFirst seenLast seen
tradezing.com 13 2026-05-13 2026-09-14
signals.tradezing.com 6 2026-07-01 2026-08-29
mta-sts.tradezing.com 2 2026-05-31 2026-08-10
support.tradezing.com 10 2026-04-23 2026-08-19
www.tradezing.com 17 2026-05-13 2026-09-14
audiox.tradezing.com 5 2026-05-24 2026-09-21

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