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.

8 hosts · 382 ms

HostCertsFirst seenLast seenDNS
trypicnic.com 33 2026-04-16 2026-08-31 ok
*.trypicnic.com 25 2026-04-16 2026-08-31 —
email.billing.trypicnic.com 4 2026-04-20 2026-08-17 ok
go.trypicnic.com 12 2026-04-25 2026-08-22 ok
tracking.notifications.trypicnic.com 4 2026-06-07 2026-10-03 ok
www.trypicnic.com 8 2026-05-05 2026-08-31 ok
*.www.trypicnic.com 8 2026-05-05 2026-08-31 —
email.notify.trypicnic.com 4 2026-04-14 2026-08-12 ok

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