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 · 289 ms

HostCertsFirst seenLast seenDNS
realsolutionsgroup.co 5 2026-04-22 2026-09-09 ok
research.realsolutionsgroup.co 3 2026-07-29 2026-09-22 ok
bam.realsolutionsgroup.co 2 2026-07-09 2026-09-01 ok
crm.realsolutionsgroup.co 10 2026-05-06 2026-09-04 ok
pto.realsolutionsgroup.co 6 2026-06-01 2026-09-27 ok
toolkit.realsolutionsgroup.co 1 2026-07-07 2026-07-07 nxdomain
www.realsolutionsgroup.co 5 2026-04-22 2026-09-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/realsolutionsgroup.co (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/realsolutionsgroup.co.