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.

11 hosts · 352 ms

HostCertsFirst seenLast seenDNS
basisset.com 16 2026-04-13 2026-08-25 ok
*.basisset.com 9 2025-10-29 2026-09-29 —
pascal3.basisset.com 1 2025-10-27 2025-10-27 nxdomain
game.basisset.com 1 2026-08-25 2026-08-25 ok
developerapi.basisset.com 1 2025-10-16 2025-10-16 ok
newsletter.basisset.com 3 2026-07-13 2026-09-13 ok
jobs.basisset.com 7 2026-04-26 2026-09-22 ok
events.basisset.com 3 2026-07-17 2026-09-18 ok
reddit.sentiment.basisset.com 2 2025-11-03 2026-10-04 ok
dev.basisset.com 1 2026-08-15 2026-08-15 ok
www.basisset.com 8 2026-04-14 2026-08-10 ok

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