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 · 260 ms

HostCertsFirst seenLast seenDNS
greenpaperproducts.com 4 2026-04-17 2026-08-19 ok
secure.greenpaperproducts.com 13 2026-05-27 2026-10-06 ok
archive.greenpaperproducts.com 4 2026-05-01 2026-09-04 ok
blog.greenpaperproducts.com 4 2026-04-15 2026-08-17 ok
inst-tk.greenpaperproducts.com 6 2026-10-01 2026-10-01 ok
info.greenpaperproducts.com 4 2026-04-17 2026-08-19 ok
www.greenpaperproducts.com 5 2026-04-21 2026-08-22 ok

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