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.

3 hosts · 263 ms

HostCertsFirst seenLast seenDNS
convoy.org 16 2026-04-08 2026-10-03 ok
*.convoy.org 13 2026-04-08 2026-10-03 —
www.convoy.org 3 2026-05-30 2026-08-06 ok

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