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.

18 hosts · 306 ms

HostCertsFirst seenLast seenDNS
exponents.com 27 2025-11-18 2026-10-06 ok
*.exponents.com 20 2025-11-18 2026-10-06 —
exposync.exponents.com 3 2026-04-17 2026-10-01 ok
www.exposync.exponents.com 3 2026-04-17 2026-10-01 nxdomain
exps-output-mod.exponents.com 8 2026-05-09 2026-09-04 ok
people.exponents.com 2 2026-08-03 2026-10-03 ok
exposync-api.exponents.com 3 2026-04-17 2026-10-01 ok
www.exposync-api.exponents.com 3 2026-04-17 2026-10-01 nxdomain
staging-api.exponents.com 8 2026-04-17 2026-10-01 ok
www.staging-api.exponents.com 3 2026-04-17 2026-10-01 nxdomain
media-cdn.exponents.com 10 2026-04-14 2026-08-11 ok
staging-admin.exponents.com 8 2026-04-17 2026-10-01 ok
www.staging-admin.exponents.com 3 2026-04-17 2026-10-01 nxdomain
tester.exponents.com 5 2026-07-11 2026-09-10 ok
marketingops.exponents.com 1 2026-09-15 2026-09-15 ok
exponents-uat.exponents.com 3 2026-04-19 2026-06-18 ok
laravelnew.exponents.com 3 2026-07-17 2026-09-16 ok
www.exponents.com 7 2026-05-02 2026-07-25 ok

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