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.

7 hosts · 304 ms

HostCertsFirst seenLast seenDNS
spalaw.com 12 2025-07-09 2026-09-30 ok
web.spalaw.com 4 2026-04-19 2026-08-19 ok
p.spalaw.com 5 2026-05-08 2026-09-06 ok
web.payments.spalaw.com 5 2026-04-24 2026-10-04 ok
mta-sts.spalaw.com 1 2026-08-18 2026-08-18 ok
host.spalaw.com 4 2026-06-06 2026-10-06 ok
www.spalaw.com 12 2025-07-09 2026-09-30 ok

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