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.

14 hosts · 266 ms

HostCertsFirst seenLast seenDNS
monsteragency.com 5 2026-05-03 2026-08-31 ok
*.monsteragency.com 5 2026-05-03 2026-08-31 —
dashboard.monsteragency.com 5 2026-05-09 2026-09-08 ok
monstermode.monsteragency.com 5 2026-05-15 2026-09-20 ok
email.mail.monsteragency.com 5 2026-04-28 2026-08-26 ok
cdn.monsteragency.com 1 2025-12-21 2025-12-21 nodata
rocketlauncher.monsteragency.com 4 2026-04-20 2026-08-23 ok
ads.monsteragency.com 6 2026-04-21 2026-08-20 ok
chatgpt-ads.monsteragency.com 5 2026-05-22 2026-09-23 ok
*.ads.monsteragency.com 6 2026-04-21 2026-08-20 —
proposals.monsteragency.com 6 2026-04-08 2026-08-21 ok
affiliateforecast.monsteragency.com 4 2026-04-17 2026-08-18 ok
waitlist.monsteragency.com 5 2026-05-23 2026-09-26 ok
index.monsteragency.com 3 2026-06-03 2026-08-04 nxdomain

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