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.

7 hosts · 333 ms

HostCertsFirst seenLast seenDNS
columbiatrustcompany.com 27 2025-07-24 2026-09-30 ok
beta.columbiatrustcompany.com 19 2026-05-16 2026-10-04 ok
production.columbiatrustcompany.com 16 2025-11-14 2026-10-04 ok
www.production.columbiatrustcompany.com 14 2026-06-06 2026-10-04 ok
demo.columbiatrustcompany.com 5 2026-05-11 2026-09-08 ok
autodiscover.columbiatrustcompany.com 2 2025-08-20 2026-07-31 ok
www.columbiatrustcompany.com 24 2025-08-15 2026-09-30 ok

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