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.

19 hosts · 336 ms

HostCertsFirst seenLast seenDNS
bscu.org 15 2025-06-27 2026-09-28 ok
*.bscu.org 14 2025-06-27 2026-09-28 —
tss3400.bscu.org 2 2025-06-21 2026-06-29 ok
ast0810.bscu.org 4 2025-09-16 2026-10-03 ok
link2.bscu.org 5 2026-05-18 2026-09-15 ok
enet-pwlive-03.bscu.org 1 2025-12-01 2025-12-01 nxdomain
host247.bscu.org 1 2026-04-14 2026-04-14 ok
olb.bscu.org 12 2026-04-16 2026-08-12 ok
marketplace.bscu.org 14 2026-06-01 2026-09-27 ok
secure.bscu.org 1 2026-05-12 2026-05-12 nxdomain
www.secure.bscu.org 1 2026-05-12 2026-05-12 nxdomain
mail.bscu.org 1 2025-11-04 2025-11-04 ok
help.bscu.org 2 2025-10-08 2026-09-08 ok
jobs.bscu.org 2 2025-08-19 2026-07-20 ok
branchservices.bscu.org 1 2025-11-18 2025-11-18 nxdomain
mta-sts.bscu.org 3 2026-07-27 2026-09-25 ok
vdi-connect.bscu.org 1 2025-06-21 2025-06-21 nxdomain
www.bscu.org 1 2026-01-30 2026-01-30 ok
email.homeequity.bscu.org 5 2026-05-08 2026-09-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bscu.org (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/bscu.org.