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.

12 hosts · 279 ms

HostCertsFirst seenLast seenDNS
viralhog.com 5 2026-05-03 2026-08-31 ok
cdn2.viralhog.com 2 2025-09-24 2026-08-25 ok
cdn3.viralhog.com 4 2026-05-19 2026-07-29 ok
enc.viralhog.com 4 2026-04-13 2026-08-12 ok
store.viralhog.com 4 2026-05-30 2026-09-27 ok
staging.viralhog.com 5 2026-05-03 2026-08-31 ok
blog.viralhog.com 3 2026-06-07 2026-08-16 ok
www.blog.viralhog.com 3 2026-06-07 2026-08-16 ok
api.viralhog.com 5 2026-05-31 2026-09-28 ok
staging.api.viralhog.com 5 2026-06-01 2026-09-30 ok
cdnu.viralhog.com 5 2026-05-01 2026-09-18 ok
www.viralhog.com 5 2026-05-04 2026-09-02 ok

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