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.

17 hosts · 328 ms

HostCertsFirst seenLast seenDNS
answeringservicecare.com 56 2026-01-22 2026-10-05 ok
*.answeringservicecare.com 31 2026-04-10 2026-10-05 —
asc-prod-clone.answeringservicecare.com 2 2026-05-01 2026-05-01 ok
secure.answeringservicecare.com 4 2026-06-06 2026-10-04 ok
go.answeringservicecare.com 9 2026-04-28 2026-08-26 ok
mcp.answeringservicecare.com 2 2026-09-09 2026-09-09 ok
*.mcp.answeringservicecare.com 2 2026-09-09 2026-09-09 —
help.answeringservicecare.com 6 2026-06-07 2026-08-05 ok
partners.answeringservicecare.com 16 2026-04-11 2026-08-08 ok
widget.answeringservicecare.com 4 2026-07-25 2026-09-22 ok
*.widget.answeringservicecare.com 4 2026-07-25 2026-09-22 —
it.answeringservicecare.com 16 2026-04-22 2026-08-18 ok
support.answeringservicecare.com 12 2026-04-11 2026-10-06 ok
mcp-support.answeringservicecare.com 2 2026-08-15 2026-08-15 ok
*.mcp-support.answeringservicecare.com 2 2026-08-15 2026-08-15 —
trust.answeringservicecare.com 4 2026-06-17 2026-08-16 ok
www.answeringservicecare.com 12 2026-01-22 2026-08-30 ok

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