Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

10 hosts · 177 ms

HostCertsFirst seenLast seen
assiduus.in 3 2026-05-09 2026-08-04
dash.assiduus.in 4 2026-06-12 2026-09-06
www.dash.assiduus.in 5 2026-05-11 2026-09-06
desk.assiduus.in 5 2026-05-11 2026-09-08
reconciliation.assiduus.in 6 2026-05-07 2026-09-09
ship.assiduus.in 4 2026-05-14 2026-07-14
sales.assiduus.in 1 2026-09-30 2026-09-30
pms.assiduus.in 5 2026-06-02 2026-09-16
rat.assiduus.in 7 2026-05-31 2026-10-06
www.assiduus.in 3 2026-05-09 2026-08-04

Programmatic access: API GET /v1/hosts/assiduus.in (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/assiduus.in.