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.

43 hosts · 517 ms

HostCertsFirst seenLast seenDNS
reputationdefender.com 6 2026-06-23 2026-09-28 ok
*.reputationdefender.com 6 2025-07-08 2026-06-26 —
mkto1.reputationdefender.com 12 2026-04-13 2026-08-10 ok
org-p8.reputationdefender.com 1 2026-04-09 2026-04-09 ok
dmadata.reputationdefender.com 1 2026-06-23 2026-06-23 nxdomain
dc.reputationdefender.com 3 2026-05-13 2026-05-22 ok
blackmagic.reputationdefender.com 3 2025-08-17 2026-07-18 nxdomain
uae.reputationdefender.com 3 2026-04-22 2026-06-23 ok
stg2-uae.reputationdefender.com 1 2026-04-11 2026-04-11 nodata
de.reputationdefender.com 3 2026-04-22 2026-06-23 ok
stg2-de.reputationdefender.com 1 2026-04-11 2026-04-11 nodata
www-preview-stage.reputationdefender.com 4 2026-03-20 2026-07-09 nxdomain
www-stage.reputationdefender.com 3 2026-03-20 2026-06-22 ok
me.reputationdefender.com 3 2025-08-17 2026-07-18 ok
validate-me.reputationdefender.com 1 2026-06-23 2026-06-23 nxdomain
api-me.reputationdefender.com 3 2025-08-17 2026-07-18 ok
admin-me.reputationdefender.com 3 2025-08-17 2026-07-18 nxdomain
repdef-api.reputationdefender.com 3 2025-08-17 2026-07-18 nxdomain
uk.reputationdefender.com 3 2026-04-22 2026-06-23 ok
stg2-uk.reputationdefender.com 1 2026-04-11 2026-04-11 nodata
blog.uk.reputationdefender.com 20 2026-04-30 2026-08-26 ok
scan.reputationdefender.com 3 2025-08-17 2026-07-18 ok
stg2-origin.reputationdefender.com 3 2025-11-24 2026-10-05 ok
lp.reputationdefender.com 12 2026-04-30 2026-08-26 ok
dc-np.reputationdefender.com 1 2026-05-22 2026-05-22 ok
fr.reputationdefender.com 3 2026-04-22 2026-06-23 ok
stg2-fr.reputationdefender.com 1 2026-04-11 2026-04-11 nodata
es.reputationdefender.com 3 2026-04-22 2026-06-23 ok
stg2-es.reputationdefender.com 1 2026-04-11 2026-04-11 nodata
directsites.reputationdefender.com 3 2025-08-17 2026-07-18 ok
clicks.reputationdefender.com 3 2026-05-05 2026-10-05 ok
oms.reputationdefender.com 2 2026-02-09 2026-02-09 ok
nagios.reputationdefender.com 1 2026-06-23 2026-06-23 nxdomain
totalradius.reputationdefender.com 2 2025-07-08 2026-06-08 ok
*.totalradius.reputationdefender.com 6 2025-07-08 2026-09-05 —
www-preview-dev.reputationdefender.com 4 2026-03-20 2026-07-09 nxdomain
www-dev.reputationdefender.com 3 2026-03-20 2026-06-22 ok
www-preview.reputationdefender.com 1 2026-03-20 2026-03-20 nxdomain
www.reputationdefender.com 5 2026-03-18 2026-06-23 ok
stg2-www.reputationdefender.com 1 2026-04-11 2026-04-11 nodata
stage-www.reputationdefender.com 1 2026-03-18 2026-03-18 nxdomain
dev-www.reputationdefender.com 1 2026-03-18 2026-03-18 nxdomain
rbx.reputationdefender.com 4 2025-11-14 2026-09-01 nxdomain

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