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.

8 hosts · 273 ms

HostCertsFirst seenLast seenDNS
simplycarbonfiber.com 15 2026-05-15 2026-09-29 ok
rave.simplycarbonfiber.com 8 2026-05-11 2026-09-08 ok
img.email.simplycarbonfiber.com 14 2026-04-24 2026-08-20 ok
r.email.simplycarbonfiber.com 4 2026-04-10 2026-09-17 ok
account.simplycarbonfiber.com 7 2026-04-20 2026-08-31 ok
www.simplycarbonfiber.com 17 2026-05-16 2026-09-25 ok
pay.simplycarbonfiber.com 1 2025-12-24 2025-12-24 ok
www.pay.simplycarbonfiber.com 1 2025-12-24 2025-12-24 nxdomain

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