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.

12 hosts · 289 ms

HostCertsFirst seenLast seenDNS
multicenter.com 6 2025-12-18 2026-10-05 ok
*.multicenter.com 2 2025-12-18 2025-12-28 —
srvmdmhead.multicenter.com 13 2026-04-30 2026-08-24 ok
mailing.multicenter.com 3 2025-07-10 2026-08-07 ok
*.mailing.multicenter.com 3 2025-07-10 2026-08-07 —
manti.multicenter.com 5 2026-04-30 2026-09-22 ok
lpn.multicenter.com 5 2026-05-28 2026-09-25 ok
appns.multicenter.com 3 2026-06-24 2026-09-21 ok
appns-test.multicenter.com 3 2026-06-24 2026-09-21 nodata
*.dev.multicenter.com 1 2025-12-18 2025-12-18 —
*.api.dev.multicenter.com 1 2025-12-18 2025-12-18 —
www.multicenter.com 5 2026-04-25 2026-09-22 ok

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