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.

20 hosts · 499 ms

HostCertsFirst seenLast seenDNS
uk.affirm.com 13 2026-02-16 2026-10-06 ok
*.uk.affirm.com 13 2026-02-16 2026-10-06 —
url4324.uk.affirm.com 5 2026-04-27 2026-09-26 ok
url4325.uk.affirm.com 5 2026-05-06 2026-10-05 ok
url4258.uk.affirm.com 7 2026-05-03 2026-10-02 ok
businesshub.uk.affirm.com 8 2026-05-27 2026-10-05 ok
cloud.e.uk.affirm.com 1 2026-06-23 2026-06-23 servfail
image.e.uk.affirm.com 35 2026-06-22 2026-08-31 ok
click.e.uk.affirm.com 1 2026-06-22 2026-06-22 ok
view.e.uk.affirm.com 1 2026-06-22 2026-06-22 ok
eutestpartner001-jwe.uk.affirm.com 2 2026-04-15 2026-04-15 nxdomain
aiagentpocrs256-jwe.uk.affirm.com 2 2026-05-06 2026-05-06 nxdomain
aiagentpoc-jwe.uk.affirm.com 2 2026-05-06 2026-05-06 nxdomain
help.uk.affirm.com 1 2026-05-12 2026-05-12 ok
url4324shop.uk.affirm.com 2 2026-03-29 2026-08-29 ok
eutestpartner001-jws.uk.affirm.com 2 2026-04-15 2026-04-15 nxdomain
aiagentpocrs256-jws.uk.affirm.com 2 2026-05-06 2026-05-06 nxdomain
aiagentpoc-jws.uk.affirm.com 2 2026-05-06 2026-05-06 nxdomain
sandbox.uk.affirm.com 9 2026-01-05 2026-08-15 ok
*.sandbox.uk.affirm.com 9 2026-01-05 2026-08-15 —

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