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.

11 hosts · 324 ms

HostCertsFirst seenLast seenDNS
cuminco.com 17 2026-04-07 2026-10-01 ok
email.update.cuminco.com 5 2026-05-11 2026-09-08 ok
jebkh.cuminco.com 2 2026-09-20 2026-09-20 ok
mail.cuminco.com 3 2026-02-02 2026-06-30 ok
production.mail.cuminco.com 6 2026-04-14 2026-09-22 ok
email.email.cuminco.com 5 2026-05-11 2026-09-08 ok
url.cuminco.com 6 2026-04-13 2026-08-05 ok
instagram.cuminco.com 3 2026-03-01 2026-07-27 ok
partners.cuminco.com 4 2026-04-15 2026-08-31 ok
account.cuminco.com 13 2026-04-15 2026-08-23 ok
www.cuminco.com 16 2026-04-07 2026-10-01 ok

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