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.

15 hosts · 421 ms

HostCertsFirst seenLast seenDNS
barharbor.bank 11 2025-10-27 2026-08-13 ok
*.barharbor.bank 10 2026-04-17 2026-08-13 —
tw1.barharbor.bank 1 2026-02-13 2026-02-13 nxdomain
tw2.barharbor.bank 1 2026-02-13 2026-02-13 nxdomain
sra3.barharbor.bank 3 2026-03-10 2026-09-22 ok
sra.barharbor.bank 3 2026-03-10 2026-09-22 ok
micollab.barharbor.bank 1 2026-02-13 2026-02-13 nxdomain
mortgage.barharbor.bank 4 2026-04-07 2026-08-05 ok
treasuryadvantage.barharbor.bank 1 2026-09-03 2026-09-03 ok
online.barharbor.bank 2 2025-07-17 2026-06-30 ok
seg.barharbor.bank 1 2026-02-10 2026-02-10 ok
refer.barharbor.bank 5 2026-05-01 2026-08-27 ok
fs.barharbor.bank 1 2026-02-09 2026-02-09 nxdomain
www.barharbor.bank 1 2025-10-27 2025-10-27 ok
securegateway.barharbor.bank 2 2026-02-09 2026-02-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/barharbor.bank (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/barharbor.bank.