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.

28 hosts · 1331 ms

HostCertsFirst seenLast seenDNS
additionfi.com 14 2026-05-22 2026-10-06 ok
*.additionfi.com 14 2025-11-10 2026-10-06 —
olb.additionfi.com 23 2025-12-10 2026-10-07 ok
uat-olb.additionfi.com 17 2025-12-09 2026-09-30 ok
*.uat-olb.additionfi.com 16 2026-04-13 2026-09-30 —
admin.uat-olb.additionfi.com 1 2025-12-09 2025-12-09 ok
*.olb.additionfi.com 21 2026-04-12 2026-10-07 —
maintenance.olb.additionfi.com 1 2026-01-29 2026-01-29 ok
admin.olb.additionfi.com 2 2025-12-10 2025-12-10 ok
lsc.additionfi.com 1 2026-02-11 2026-02-11 ok
*.fraud.additionfi.com 1 2025-12-11 2025-12-11 —
mail-content.fraud.additionfi.com 1 2025-12-11 2025-12-11 ok
mortgage.additionfi.com 1 2026-02-11 2026-02-11 ok
servicedesk.additionfi.com 12 2026-05-14 2026-09-11 ok
admin-portal.additionfi.com 1 2026-02-11 2026-02-11 ok
lender-portal.additionfi.com 1 2026-02-11 2026-02-11 ok
borrower-portal.additionfi.com 1 2026-02-11 2026-02-11 ok
affinity-portal.additionfi.com 1 2026-02-11 2026-02-11 ok
foundation.additionfi.com 12 2026-04-23 2026-08-20 ok
*.corp.additionfi.com 1 2025-11-10 2025-11-10 —
evolveserv.corp.additionfi.com 1 2026-06-05 2026-06-05 nxdomain
resources.additionfi.com 8 2026-04-22 2026-08-19 ok
images.additionfi.com 24 2025-07-19 2026-09-30 ok
pages.additionfi.com 10 2026-04-24 2026-08-19 ok
emails.additionfi.com 6 2026-04-25 2026-08-19 ok
los.additionfi.com 1 2026-02-11 2026-02-11 ok
mta-sts.additionfi.com 3 2026-04-11 2026-08-31 ok
www.additionfi.com 1 2026-06-05 2026-06-05 ok

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