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 · 350 ms

HostCertsFirst seenLast seenDNS
nathanjames.com 16 2026-05-17 2026-09-28 ok
i3.nathanjames.com 3 2026-05-14 2026-09-03 ok
i.nathanjames.com 1 2026-05-19 2026-05-19 ok
help.nathanjames.com 2 2025-06-22 2026-05-23 ok
returns.nathanjames.com 4 2026-04-16 2026-08-14 ok
account.nathanjames.com 13 2026-04-29 2026-09-06 ok
www.nathanjames.com 13 2026-05-16 2026-09-25 ok

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