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.

12 hosts · 347 ms

HostCertsFirst seenLast seenDNS
twogate.com 17 2025-11-11 2026-09-15 ok
*.twogate.com 8 2025-11-11 2026-09-15 —
store.twogate.com 16 2026-04-10 2026-10-07 ok
blog.twogate.com 7 2025-12-03 2026-09-03 ok
stg.twogate.com 5 2026-06-07 2026-10-01 ok
sso.twogate.com 9 2026-05-03 2026-10-05 ok
devcamp.twogate.com 7 2026-05-22 2026-10-01 ok
pitch.devcamp.twogate.com 2 2026-08-18 2026-08-18 ok
*.pitch.devcamp.twogate.com 2 2026-08-18 2026-08-18 —
poc-shop.twogate.com 6 2026-07-02 2026-08-30 ok
sp.poc-shop.twogate.com 4 2026-07-02 2026-08-30 ok
assets.twogate.com 2 2026-08-26 2026-08-26 ok

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