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 · 280 ms

HostCertsFirst seenLast seenDNS
gofractional.com 19 2026-05-17 2026-10-04 ok
*.gofractional.com 13 2026-05-27 2026-10-04 —
tag.gofractional.com 5 2026-04-24 2026-10-03 ok
staging.gofractional.com 6 2026-06-02 2026-10-03 ok
billing.gofractional.com 10 2026-04-21 2026-08-17 ok
k.gofractional.com 10 2026-05-22 2026-09-17 ok
playbook.gofractional.com 10 2026-04-25 2026-08-22 ok
clerk.gofractional.com 10 2026-04-21 2026-08-17 ok
app.gofractional.com 5 2026-05-10 2026-09-07 ok
staging-app.gofractional.com 5 2026-05-10 2026-09-06 ok
affiliates.gofractional.com 5 2026-05-27 2026-09-24 ok
links.gofractional.com 12 2026-05-07 2026-09-02 ok
accounts.gofractional.com 10 2026-04-20 2026-08-16 ok
status.gofractional.com 4 2026-04-20 2026-08-17 ok
links.news.gofractional.com 3 2026-04-21 2026-09-21 ok
support.gofractional.com 1 2026-07-14 2026-07-14 ok
www.gofractional.com 5 2026-05-19 2026-09-20 ok

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