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.

17 hosts · 425 ms

HostCertsFirst seenLast seenDNS
argyle.com 40 2026-05-04 2026-10-03 ok
*.argyle.com 31 2026-05-04 2026-10-03 —
state.argyle.com 3 2026-09-30 2026-09-30 nxdomain
staging.argyle.com 9 2026-05-27 2026-09-22 ok
with.argyle.com 4 2026-04-21 2026-08-19 ok
saml.argyle.com 5 2026-05-15 2026-09-09 ok
notion.argyle.com 8 2026-05-15 2026-09-10 ok
develop.argyle.com 8 2026-05-21 2026-09-16 ok
*.develop.argyle.com 18 2026-04-20 2026-09-17 —
saml.develop.argyle.com 5 2026-05-16 2026-09-07 ok
s.argyle.com 9 2026-05-22 2026-09-19 ok
docs.argyle.com 16 2026-04-28 2026-09-01 ok
status.argyle.com 6 2026-04-10 2026-10-01 ok
get.argyle.com 10 2026-04-22 2026-08-18 ok
support.argyle.com 6 2026-05-04 2026-09-01 ok
trust.argyle.com 9 2026-04-25 2026-08-21 ok
www.argyle.com 11 2026-05-27 2026-09-22 ok

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