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.

59 hosts · 398 ms

HostCertsFirst seenLast seenDNS
importgenius.com 9 2026-03-13 2026-09-08 ok
*.importgenius.com 9 2026-03-13 2026-09-29 —
gtmstape01.importgenius.com 5 2026-05-01 2026-08-29 ok
load.gtmstape01.importgenius.com 16 2026-04-30 2026-08-27 ok
*.m31.importgenius.com 2 2025-06-13 2026-05-12 —
w2.importgenius.com 6 2026-04-25 2026-08-21 ok
w3.importgenius.com 11 2026-05-18 2026-09-14 ok
*.m104.importgenius.com 2 2025-06-13 2026-05-12 —
prd.importgenius.com 1 2026-07-22 2026-07-22 nodata
*.prd.importgenius.com 1 2026-07-22 2026-07-22 —
finance.importgenius.com 108 2026-05-13 2026-08-10 ok
bright.marketing.importgenius.com 3 2026-07-28 2026-09-26 ok
stg.importgenius.com 2 2025-11-05 2025-11-05 ok
*.stg.importgenius.com 2 2025-11-05 2025-11-05 —
ai.stg.importgenius.com 3 2026-03-19 2026-08-19 nodata
*.ai.stg.importgenius.com 3 2026-03-19 2026-08-19 —
api.stg.importgenius.com 1 2025-11-10 2025-11-10 nodata
*.api.stg.importgenius.com 1 2025-11-10 2025-11-10 —
admin.stg.importgenius.com 1 2025-11-05 2025-11-05 nodata
*.admin.stg.importgenius.com 1 2025-11-05 2025-11-05 —
t.stg.importgenius.com 8 2026-04-19 2026-08-16 ok
dev.stg.importgenius.com 1 2026-05-18 2026-05-18 nodata
*.dev.stg.importgenius.com 1 2026-05-18 2026-05-18 —
observability.stg.importgenius.com 1 2025-11-17 2025-11-17 ok
*.observability.stg.importgenius.com 1 2025-11-17 2025-11-17 —
internal.importgenius.com 3 2026-07-22 2026-08-03 ok
stg-internal.importgenius.com 2 2025-12-05 2025-12-07 nodata
*.stg-internal.importgenius.com 2 2025-12-05 2025-12-07 —
data.stg-internal.importgenius.com 1 2026-01-20 2026-01-20 nodata
*.data.stg-internal.importgenius.com 1 2026-01-20 2026-01-20 —
research.stg-internal.importgenius.com 1 2026-06-30 2026-06-30 nodata
*.research.stg-internal.importgenius.com 1 2026-06-30 2026-06-30 —
ai.stg-internal.importgenius.com 2 2026-04-30 2026-09-30 nxdomain
*.ai.stg-internal.importgenius.com 2 2026-04-30 2026-09-30 —
api.stg-internal.importgenius.com 1 2025-12-07 2025-12-07 nodata
*.api.stg-internal.importgenius.com 1 2025-12-07 2025-12-07 —
admin.stg-internal.importgenius.com 1 2025-12-07 2025-12-07 nodata
*.admin.stg-internal.importgenius.com 1 2025-12-07 2025-12-07 —
dev.stg-internal.importgenius.com 1 2026-01-19 2026-01-19 nodata
*.dev.stg-internal.importgenius.com 1 2026-01-19 2026-01-19 —
observability.stg-internal.importgenius.com 1 2025-12-07 2025-12-07 nodata
*.observability.stg-internal.importgenius.com 1 2025-12-07 2025-12-07 —
*.internal.importgenius.com 3 2026-07-22 2026-08-03 —
observability.internal.importgenius.com 1 2026-08-03 2026-08-03 nodata
*.observability.internal.importgenius.com 2 2026-08-03 2026-08-03 —
en.importgenius.com 8 2026-04-22 2026-06-20 ok
login.importgenius.com 10 2026-05-01 2026-08-28 ok
staging-login.importgenius.com 10 2026-05-01 2026-08-28 ok
dev-login.importgenius.com 10 2026-04-30 2026-08-27 ok
*.ecs.importgenius.com 1 2025-11-25 2025-11-25 —
js.importgenius.com 1 2026-10-02 2026-10-02 ok
forms.importgenius.com 10 2026-05-16 2026-09-13 ok
t.importgenius.com 8 2026-05-01 2026-08-27 ok
connect.importgenius.com 5 2026-05-22 2026-09-18 ok
meet.importgenius.com 5 2026-04-23 2026-08-24 ok
support.importgenius.com 10 2026-05-07 2026-09-05 ok
gov.importgenius.com 1 2026-09-30 2026-09-30 ok
console-flow.importgenius.com 11 2026-05-31 2026-09-26 ok
email.notify.importgenius.com 1 2026-08-25 2026-08-25 ok

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