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.

9 hosts · 285 ms

HostCertsFirst seenLast seenDNS
intervalintl.com 1 2026-05-07 2026-05-07 ok
*.intervalintl.com 2 2025-11-17 2026-05-07 —
securefileshare.intervalintl.com 1 2026-08-11 2026-08-11 ok
web-securefileshare.intervalintl.com 1 2026-08-11 2026-08-11 nodata
api.intervalintl.com 1 2026-08-11 2026-08-11 ok
sorryserver.intervalintl.com 1 2026-08-11 2026-08-11 ok
mobservices.intervalintl.com 1 2026-08-11 2026-08-11 ok
extservices.intervalintl.com 2 2026-05-07 2026-08-11 ok
staging-extservices.intervalintl.com 1 2026-08-03 2026-08-03 ok

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