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.

5 hosts · 348 ms

HostCertsFirst seenLast seenDNS
*.revolab.com 1 2026-07-01 2026-07-01 —
mdr2.revolab.com 1 2026-09-30 2026-09-30 ok
cdn.revolab.com 1 2025-12-11 2025-12-11 ok
receipts.revolab.com 2 2025-09-17 2026-08-18 ok
receipt.revolab.com 2 2025-09-17 2026-08-18 nxdomain

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