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.

15 hosts · 304 ms

HostCertsFirst seenLast seenDNS
contexte.com 4 2025-10-17 2026-09-16 ok
*.contexte.com 4 2025-10-17 2026-09-16 —
user-data.contexte.com 3 2026-05-24 2026-09-07 ok
l.contexte.com 8 2026-05-01 2026-08-27 ok
trail.contexte.com 6 2026-04-13 2026-08-27 ok
go.contexte.com 8 2026-05-01 2026-07-30 ok
help.contexte.com 3 2026-06-13 2026-08-12 ok
updates.contexte.com 5 2026-04-24 2026-08-25 ok
mxmxemails.contexte.com 10 2026-05-11 2026-09-21 ok
*.tools.contexte.com 1 2025-12-23 2025-12-23 —
5ans.contexte.com 12 2026-05-31 2026-09-26 ok
apps.contexte.com 6 2026-04-21 2026-09-03 ok
get.contexte.com 10 2026-04-13 2026-08-09 ok
about.contexte.com 8 2026-04-30 2026-08-26 ok
www.contexte.com 1 2025-12-23 2025-12-23 ok

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