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.

24 hosts · 244 ms

HostCertsFirst seenLast seenDNS
mufgcard.com 2 2025-10-30 2026-09-29 ok
munapp1.mufgcard.com 2 2026-06-25 2026-06-25 nodata
*.munapp1.mufgcard.com 2 2026-06-25 2026-06-25 —
www2.mufgcard.com 1 2026-02-16 2026-02-16 ok
dev.www4.mufgcard.com 3 2026-04-17 2026-09-17 ok
dev.www5.mufgcard.com 1 2025-11-10 2025-11-10 ok
dev.www6.mufgcard.com 2 2026-04-17 2026-09-17 ok
dev.www7.mufgcard.com 1 2025-11-10 2025-11-10 ok
dev.www8.mufgcard.com 3 2026-04-17 2026-09-17 ok
dev.www99.mufgcard.com 3 2026-04-17 2026-09-17 ok
dev.www9.mufgcard.com 1 2025-11-10 2025-11-10 ok
api.mufgcard.com 2 2026-02-16 2026-02-16 ok
dev.www5.api.mufgcard.com 1 2025-11-10 2025-11-10 ok
dev.www7.api.mufgcard.com 1 2025-11-10 2025-11-10 ok
dev.www9.api.mufgcard.com 1 2025-11-10 2025-11-10 ok
dev.www3t.api.mufgcard.com 1 2026-01-14 2026-01-14 ok
dev.www5t.api.mufgcard.com 1 2026-01-14 2026-01-14 ok
dev.www7t.api.mufgcard.com 1 2026-01-14 2026-01-14 ok
dev.www9t.api.mufgcard.com 2 2026-01-14 2026-01-14 ok
dev.www3t.mufgcard.com 1 2026-01-13 2026-01-13 ok
dev.www5t.mufgcard.com 1 2026-01-13 2026-01-13 ok
dev.www7t.mufgcard.com 1 2026-01-14 2026-01-14 ok
dev.www9t.mufgcard.com 2 2026-01-14 2026-01-14 ok
www.mufgcard.com 2 2025-10-30 2026-09-29 ok

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