Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

12 hosts · 246 ms

HostCertsFirst seenLast seen
handshakecommunity.ai 9 2026-05-04 2026-08-30
*.handshakecommunity.ai 9 2026-05-04 2026-08-30
obsidian.handshakecommunity.ai 10 2026-04-14 2026-10-08
*.obsidian.handshakecommunity.ai 10 2026-04-14 2026-10-08
openvpn.handshakecommunity.ai 3 2026-07-27 2026-09-25
oscar.handshakecommunity.ai 12 2026-05-19 2026-10-01
*.oscar.handshakecommunity.ai 12 2026-05-19 2026-10-01
projectoscar.handshakecommunity.ai 5 2026-05-31 2026-10-02
publicspaces.handshakecommunity.ai 14 2026-05-29 2026-09-24
*.publicspaces.handshakecommunity.ai 14 2026-05-29 2026-09-24
sonnet.handshakecommunity.ai 3 2026-10-02 2026-10-03
*.sonnet.handshakecommunity.ai 3 2026-10-02 2026-10-03

Programmatic access: API GET /v1/hosts/handshakecommunity.ai (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/handshakecommunity.ai.