Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

12 hosts · 217 ms

HostCertsFirst seenLast seen
replacingrisk.com 22 2026-04-19 2026-08-31
*.replacingrisk.com 16 2026-05-01 2026-08-28
staging.replacingrisk.com 4 2026-04-19 2026-08-19
www.staging.replacingrisk.com 4 2026-04-19 2026-08-19
webdisk.replacingrisk.com 5 2026-05-01 2026-08-31
mail.replacingrisk.com 6 2026-04-19 2026-08-31
webmail.replacingrisk.com 5 2026-05-01 2026-08-31
forms.replacingrisk.com 10 2026-05-05 2026-09-04
webinars.replacingrisk.com 1 2026-04-13 2026-04-13
support.replacingrisk.com 10 2026-06-05 2026-10-04
www.replacingrisk.com 6 2026-04-19 2026-08-31
survey.replacingrisk.com 12 2026-05-10 2026-09-07

Programmatic access: API GET /v1/hosts/replacingrisk.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/replacingrisk.com.