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.

8 hosts · 228 ms

HostCertsFirst seenLast seenDNS
yplasma.tech 11 2026-06-02 2026-09-28 ok
agmjune26.yplasma.tech 6 2026-06-23 2026-08-21 ok
deck.yplasma.tech 9 2026-05-22 2026-09-17 ok
techdeck.yplasma.tech 14 2026-05-22 2026-09-18 ok
investorsdeck.yplasma.tech 9 2026-06-03 2026-09-29 ok
shortdeck.yplasma.tech 10 2026-04-10 2026-10-05 ok
bizdeck.yplasma.tech 8 2026-05-12 2026-09-07 ok
www.yplasma.tech 11 2026-06-02 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/yplasma.tech (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/yplasma.tech.