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.

10 hosts · 315 ms

HostCertsFirst seenLast seenDNS
dscc.org 27 2026-04-13 2026-09-30 ok
*.dscc.org 13 2026-05-22 2026-09-30 —
archive-2025.dscc.org 10 2026-04-30 2026-08-26 ok
dm.dscc.org 1 2026-01-16 2026-01-16 ok
scim.dscc.org 34 2026-05-03 2026-09-21 ok
fin.dscc.org 1 2026-01-16 2026-01-16 ok
action.dscc.org 15 2026-04-16 2026-09-24 ok
go.dscc.org 38 2026-04-21 2026-09-29 ok
www.dscc.org 10 2026-04-14 2026-08-10 ok
survey.dscc.org 4 2025-08-21 2026-07-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/dscc.org (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/dscc.org.