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.

14 hosts · 457 ms

HostCertsFirst seenLast seenDNS
formica.com 4 2026-03-03 2026-09-29 ok
*.formica.com 1 2026-03-03 2026-03-03 —
schedule.formica.com 5 2026-05-19 2026-09-18 ok
nastore.formica.com 5 2026-05-07 2026-09-04 ok
helpdesk.formica.com 22 2026-05-09 2026-09-26 ok
testhelpdesk.formica.com 4 2026-05-15 2026-05-15 nxdomain
freshadmin.formica.com 4 2026-05-30 2026-05-30 ok
quing-pu-vpn.formica.com 6 2026-03-31 2026-09-16 ok
quing-pu-vpn-backup.formica.com 6 2026-03-31 2026-09-16 nxdomain
mta-sts.broadviewmaterials.formica.com 1 2026-09-14 2026-09-14 ok
mta-sts.formica.com 5 2026-05-23 2026-09-21 ok
chatbot.formica.com 2 2026-02-24 2026-06-16 ok
www.formica.com 3 2026-09-27 2026-09-29 ok
quing-pu-vpn-primary.formica.com 6 2026-03-31 2026-09-16 nxdomain

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