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.

22 hosts · 284 ms

HostCertsFirst seenLast seenDNS
markarch.com 32 2025-11-12 2026-10-01 ok
*.markarch.com 32 2025-11-12 2026-10-01 —
matrexadminqa.markarch.com 4 2026-02-16 2026-09-30 ok
matrexqa.markarch.com 4 2026-02-09 2026-09-23 ok
finonboard.markarch.com 6 2026-05-21 2026-08-05 ok
llm-faceoff-stage.markarch.com 4 2026-02-06 2026-09-21 ok
api-internal-stage.markarch.com 4 2026-02-07 2026-09-22 ok
cie.markarch.com 1 2026-04-12 2026-04-12 nodata
llm-faceoff.markarch.com 4 2026-01-25 2026-09-09 ok
cie-api.markarch.com 2 2026-04-12 2026-06-23 ok
api-internal.markarch.com 3 2026-02-07 2026-09-22 ok
n8n.markarch.com 3 2026-02-07 2026-09-22 ok
matrexadmin.markarch.com 4 2026-02-12 2026-09-27 ok
beacon.markarch.com 1 2026-07-14 2026-07-14 ok
ado.markarch.com 2 2026-02-23 2026-06-15 ok
scriptmaster.markarch.com 3 2026-02-19 2026-10-04 ok
docs.markarch.com 2 2026-02-11 2026-06-24 ok
restrictions.markarch.com 4 2026-02-04 2026-09-19 ok
mobius.markarch.com 3 2026-02-16 2026-08-31 ok
api-internal-dev.markarch.com 4 2026-02-07 2026-09-22 ok
matrex.markarch.com 4 2026-02-10 2026-09-25 ok
api-notify.markarch.com 4 2026-02-07 2026-09-22 ok

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