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 · 279 ms

HostCertsFirst seenLast seenDNS
cobra.com 15 2026-05-16 2026-09-25 ok
affiliate.cobra.com 2 2026-08-05 2026-10-05 ok
click.cobra.com 10 2026-05-02 2026-08-28 ok
retail.cobra.com 16 2026-05-24 2026-10-05 ok
shop.cobra.com 13 2026-05-16 2026-09-26 ok
enter.cobra.com 11 2026-04-18 2026-08-21 ok
ss.cobra.com 5 2026-05-14 2026-09-11 ok
load.ss.cobra.com 8 2026-05-23 2026-09-18 ok
support.cobra.com 10 2026-05-20 2026-09-15 ok
eu.cobra.com 12 2026-05-18 2026-09-30 ok
www.cobra.com 11 2026-05-15 2026-09-28 ok

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