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.

17 hosts · 324 ms

HostCertsFirst seenLast seenDNS
tentbox.com 17 2026-01-06 2026-09-27 ok
*.tentbox.com 1 2026-01-06 2026-01-06 —
club.tentbox.com 5 2026-05-09 2026-09-12 ok
wd.tentbox.com 8 2026-04-21 2026-08-17 ok
effinity-de.tentbox.com 7 2026-04-13 2026-09-07 ok
ie.tentbox.com 12 2026-04-11 2026-09-25 ok
www.ie.tentbox.com 17 2026-05-23 2026-10-02 ok
go.tentbox.com 5 2026-05-29 2026-09-25 ok
www.go.tentbox.com 5 2026-05-29 2026-09-25 ok
demo.tentbox.com 5 2026-05-18 2026-09-21 ok
app.tentbox.com 5 2026-05-13 2026-09-15 ok
effinity-fr.tentbox.com 7 2026-04-13 2026-09-07 ok
us.tentbox.com 5 2026-05-09 2026-09-10 ok
visit.tentbox.com 5 2026-06-06 2026-10-02 ok
eu.tentbox.com 17 2026-04-17 2026-10-01 ok
www.eu.tentbox.com 5 2026-05-12 2026-09-09 ok
www.tentbox.com 15 2026-04-14 2026-09-25 ok

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