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.

14 hosts · 250 ms

HostCertsFirst seenLast seenDNS
tportho.com 15 2025-09-15 2026-09-17 ok
*.tportho.com 13 2025-12-31 2026-09-17 —
crm.tportho.com 54 2026-04-14 2026-08-21 ok
rmtvpn.tportho.com 3 2025-09-09 2026-09-02 ok
www.rmtvpn.tportho.com 3 2025-09-09 2026-09-02 nxdomain
shop.tportho.com 5 2026-05-07 2026-08-26 ok
tpoviewer.tportho.com 3 2026-04-19 2026-09-19 ok
eventpics.tportho.com 5 2026-05-17 2026-09-04 ok
test.tportho.com 5 2026-05-11 2026-08-30 ok
thankyou.tportho.com 5 2026-04-14 2026-09-27 ok
wvw.tportho.com 8 2026-04-27 2026-07-26 ok
www.tportho.com 2 2025-09-15 2025-09-15 ok
tprx.tportho.com 1 2025-09-29 2025-09-29 ok
www.tprx.tportho.com 1 2025-09-29 2025-09-29 nxdomain

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