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.

11 hosts · 372 ms

HostCertsFirst seenLast seenDNS
atlascard.com 5 2025-06-29 2026-09-09 ok
*.atlascard.com 4 2025-06-29 2026-09-09 —
dining.atlascard.com 8 2026-04-19 2026-08-15 ok
link.atlascard.com 7 2026-06-01 2026-09-29 ok
langfuse.internal.atlascard.com 1 2026-09-17 2026-09-17 nxdomain
api.internal.atlascard.com 1 2026-07-21 2026-07-21 nxdomain
api-dev.internal.atlascard.com 1 2026-07-21 2026-07-21 nxdomain
travel.atlascard.com 5 2026-05-08 2026-09-09 ok
hotels.atlascard.com 4 2026-06-03 2026-10-04 ok
travel-dev.atlascard.com 5 2026-05-07 2026-09-09 ok
preview.atlascard.com 1 2026-08-18 2026-08-18 ok

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