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.

39 hosts · 334 ms

HostCertsFirst seenLast seenDNS
aprco.com 10 2026-05-07 2026-09-02 ok
bid-analyzer-stage.aprco.com 3 2025-10-07 2026-09-07 ok
www.bid-analyzer-stage.aprco.com 3 2025-10-07 2026-09-07 nxdomain
townsquare.aprco.com 4 2026-04-21 2026-09-06 ok
marketing.aprco.com 13 2026-06-02 2026-09-29 ok
blog.aprco.com 20 2026-04-29 2026-08-25 ok
capri.aprco.com 2 2026-08-19 2026-08-20 ok
prod-adi.capri.aprco.com 2 2026-05-29 2026-07-25 ok
staging-adi.capri.aprco.com 2 2026-05-24 2026-07-15 ok
dev-adi.capri.aprco.com 2 2026-05-26 2026-07-21 ok
compass.capri.aprco.com 3 2026-06-26 2026-08-20 ok
stage.compass.capri.aprco.com 2 2026-06-26 2026-08-19 ok
api.compass.capri.aprco.com 2 2026-06-26 2026-08-18 ok
stage.api.compass.capri.aprco.com 3 2026-06-26 2026-08-23 ok
dev.api.compass.capri.aprco.com 2 2026-06-26 2026-08-18 ok
dev.compass.capri.aprco.com 2 2026-06-26 2026-08-17 ok
ingest.capri.aprco.com 1 2026-08-13 2026-08-13 ok
stage-ingest.capri.aprco.com 2 2026-08-13 2026-10-06 ok
dev-ingest.capri.aprco.com 3 2026-08-13 2026-10-05 ok
email.aprco.com 14 2026-04-28 2026-08-24 ok
stage.emm.aprco.com 3 2026-05-16 2026-09-04 ok
api.emm.aprco.com 3 2026-05-19 2026-09-04 ok
stage.api.emm.aprco.com 3 2026-05-22 2026-09-08 ok
dev.api.emm.aprco.com 3 2026-05-15 2026-08-29 ok
app.emm.aprco.com 3 2026-05-26 2026-09-09 ok
dev.emm.aprco.com 3 2026-05-16 2026-08-31 ok
acero.aprco.com 4 2026-05-29 2026-09-16 ok
qa.acero.aprco.com 3 2026-05-25 2026-09-09 ok
ui.qa.acero.aprco.com 3 2026-05-25 2026-09-09 ok
stage.acero.aprco.com 3 2026-05-14 2026-08-29 ok
ui.stage.acero.aprco.com 3 2026-05-14 2026-08-29 ok
ui.acero.aprco.com 4 2026-05-29 2026-09-16 ok
green.acero.aprco.com 3 2026-05-15 2026-09-01 ok
ui.green.acero.aprco.com 3 2026-05-15 2026-09-01 ok
bid-analyzer.aprco.com 3 2025-10-07 2026-09-07 ok
www.bid-analyzer.aprco.com 3 2025-10-07 2026-09-07 nxdomain
bid-analyzer-dev.aprco.com 3 2025-10-07 2026-09-07 ok
www.bid-analyzer-dev.aprco.com 3 2025-10-07 2026-09-07 nxdomain
www.aprco.com 12 2026-05-06 2026-09-02 ok

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