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.

8 hosts · 289 ms

HostCertsFirst seenLast seenDNS
marketmasterygroup.com 6 2025-11-13 2026-10-04 ok
*.marketmasterygroup.com 1 2025-11-13 2025-11-13 —
email.mg.marketmasterygroup.com 5 2026-04-29 2026-08-27 ok
learn.marketmasterygroup.com 10 2026-05-08 2026-09-04 ok
register.marketmasterygroup.com 5 2026-05-06 2026-09-20 ok
events.marketmasterygroup.com 6 2026-05-07 2026-09-03 ok
mta-sts.marketmasterygroup.com 2 2026-04-09 2026-06-19 ok
www.marketmasterygroup.com 5 2026-05-18 2026-10-04 ok

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