Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

41 hosts · 251 ms

HostCertsFirst seenLast seen
citizenm.com 4 2025-07-29 2026-08-15
*.citizenm.com 3 2025-07-29 2026-09-07
static.citizenm.com 3 2026-05-22 2026-10-04
acc-static.citizenm.com 2 2026-05-22 2026-10-04
test-static.citizenm.com 2 2026-05-24 2026-10-06
acc-allbitstillgood.citizenm.com 1 2026-02-19 2026-02-19
e.citizenm.com 3 2026-06-14 2026-08-29
service.citizenm.com 4 2026-05-25 2026-10-07
acc-service.citizenm.com 3 2026-05-22 2026-10-04
test-service.citizenm.com 2 2026-05-25 2026-10-07
google.citizenm.com 5 2026-04-29 2026-08-22
link.citizenm.com 12 2026-05-03 2026-08-29
brandportal.citizenm.com 1 2025-12-09 2025-12-09
vo.citizenm.com 2 2026-05-24 2026-05-24
acc-rpi-realtime.cdp.citizenm.com 1 2026-08-20 2026-08-20
prod-rpi-realtime.cdp.citizenm.com 1 2026-08-07 2026-08-07
sleep.citizenm.com 8 2026-05-07 2026-05-07
app.citizenm.com 5 2026-05-30 2026-09-22
invoices.citizenm.com 3 2026-05-25 2026-10-07
acc-invoices.citizenm.com 3 2026-05-22 2026-10-04
test-invoices.citizenm.com 3 2026-05-22 2026-10-04
dev-invoices.citizenm.com 3 2026-05-22 2026-10-03
careers.citizenm.com 1 2025-11-18 2025-11-18
assets.citizenm.com 4 2026-05-24 2026-10-05
staticbits.citizenm.com 2 2026-05-24 2026-10-06
acc-staticbits.citizenm.com 3 2026-05-22 2026-10-04
test-staticbits.citizenm.com 3 2026-05-22 2026-10-04
dev-staticbits.citizenm.com 2 2026-05-22 2026-10-04
goodbits.citizenm.com 3 2026-05-24 2026-10-05
acc-goodbits.citizenm.com 3 2026-05-22 2026-10-04
test-goodbits.citizenm.com 4 2026-05-24 2026-10-05
dev-goodbits.citizenm.com 2 2026-05-22 2026-10-04
busybits.citizenm.com 3 2026-05-22 2026-10-04
acc-busybits.citizenm.com 3 2026-05-22 2026-10-03
test-busybits.citizenm.com 3 2026-05-22 2026-10-04
dev-busybits.citizenm.com 2 2026-05-22 2026-10-04
sstpreview.citizenm.com 4 2026-05-22 2026-10-04
www.citizenm.com 3 2026-06-10 2026-08-15
acc-www.citizenm.com 2 2026-05-22 2026-10-04
stg-www.citizenm.com 3 2026-05-22 2026-10-04
test-www.citizenm.com 4 2026-05-24 2026-10-05

Programmatic access: API GET /v1/hosts/citizenm.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/citizenm.com.