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.

16 hosts · 397 ms

HostCertsFirst seenLast seenDNS
osnplus.com 9 2025-12-08 2026-09-09 ok
*.osnplus.com 9 2025-12-08 2026-09-09 —
calendar2026.osnplus.com 4 2026-04-21 2026-08-23 ok
emails.corporate.osnplus.com 2 2026-05-29 2026-05-29 servfail
open.osnplus.com 5 2026-05-01 2026-09-30 ok
tvchannelplanner.osnplus.com 3 2026-06-08 2026-08-10 ok
partner.osnplus.com 3 2026-03-14 2026-09-17 ok
s2s.osnplus.com 2 2025-08-27 2026-07-28 ok
emails.giftcards.osnplus.com 2 2026-05-03 2026-05-03 servfail
emails.partnerships.osnplus.com 2 2026-05-17 2026-05-17 servfail
*.osntvcompat.osnplus.com 5 2026-05-30 2026-09-27 —
support.osnplus.com 6 2026-05-14 2026-09-25 ok
*.osntvdev.osnplus.com 5 2026-04-27 2026-08-25 —
*.osntvprx.osnplus.com 5 2026-05-16 2026-09-13 —
aipiracy.osnplus.com 5 2026-05-05 2026-09-06 ok
survey.osnplus.com 2 2026-05-03 2026-05-03 ok

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