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.

23 hosts · 328 ms

HostCertsFirst seenLast seenDNS
remonon.com 8 2025-10-21 2026-07-09 ok
*.remonon.com 8 2025-10-21 2026-07-09 —
staging.remonon.com 13 2025-10-21 2026-07-05 ok
*.staging.remonon.com 13 2025-10-21 2026-07-05 —
*.admin.staging.remonon.com 2 2026-05-20 2026-05-20 —
beta.admin.staging.remonon.com 2 2026-07-05 2026-07-05 ok
beta.externals.staging.remonon.com 2 2026-07-05 2026-07-05 ok
mta-sts.external.remonon.com 1 2026-09-29 2026-09-29 ok
*.admin.remonon.com 2 2026-05-20 2026-05-20 —
beta.admin.remonon.com 2 2026-07-09 2026-07-09 ok
beta.externals.remonon.com 2 2026-07-09 2026-07-09 ok
mta-sts.remonon.com 1 2026-09-29 2026-09-29 ok
development.remonon.com 7 2025-12-10 2026-07-24 ok
*.development.remonon.com 7 2025-12-10 2026-07-24 —
beta.admin.development.remonon.com 2 2026-07-24 2026-07-24 ok
beta.externals.development.remonon.com 2 2026-07-24 2026-07-24 ok
staging-eu.remonon.com 12 2026-04-17 2026-07-05 nxdomain
*.staging-eu.remonon.com 12 2026-04-17 2026-07-05 —
*.admin.staging-eu.remonon.com 2 2026-05-20 2026-05-20 —
beta.admin.staging-eu.remonon.com 2 2026-07-05 2026-07-05 nxdomain
beta.externals.staging-eu.remonon.com 2 2026-07-05 2026-07-05 nxdomain
sandbox.remonon.com 3 2026-04-14 2026-04-15 nxdomain
*.sandbox.remonon.com 3 2026-04-14 2026-04-15 —

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