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.

57 hosts · 430 ms

HostCertsFirst seenLast seen
extra.app 46 2026-04-16 2026-10-10
*.extra.app 34 2026-04-16 2026-10-10
*.a.extra.app 13 2026-06-03 2026-09-29
*.prod.a.extra.app 13 2026-06-03 2026-09-29
*.services.prod.a.extra.app 13 2026-06-03 2026-09-29
absolem.services.prod.a.extra.app 5 2026-04-23 2026-08-21
*.serverless.prod.a.extra.app 1 2025-11-17 2025-11-17
card.serverless.prod.a.extra.app 1 2026-02-12 2026-02-12
auth.serverless.prod.a.extra.app 3 2025-09-10 2026-08-11
sweepstakes-api.serverless.prod.a.extra.app 1 2025-09-17 2025-09-17
funnel.serverless.prod.a.extra.app 1 2026-02-09 2026-02-09
api.funnel.serverless.prod.a.extra.app 1 2026-02-10 2026-02-10
reactivation.serverless.prod.a.extra.app 1 2026-01-26 2026-01-26
user.serverless.prod.a.extra.app 1 2026-02-12 2026-02-12
persona-adapter.serverless.prod.a.extra.app 1 2026-01-28 2026-01-28
gateway.serverless.prod.a.extra.app 1 2026-02-12 2026-02-12
*.daytonfloyd.a.extra.app 2 2025-11-05 2026-10-06
auth.daytonfloyd.a.extra.app 1 2026-02-16 2026-02-16
api.agreements.dayton.daytonfloyd.a.extra.app 2 2026-03-24 2026-08-24
user.daytonfloyd.a.extra.app 1 2026-02-19 2026-02-19
gateway.daytonfloyd.a.extra.app 1 2026-02-16 2026-02-16
card.serverless.stage.a.extra.app 1 2026-02-12 2026-02-12
sweepstakes-api.serverless.stage.a.extra.app 2 2025-09-17 2026-08-18
funnel.serverless.stage.a.extra.app 1 2026-02-09 2026-02-09
api.funnel.serverless.stage.a.extra.app 1 2026-02-10 2026-02-10
reactivation.serverless.stage.a.extra.app 1 2026-01-25 2026-01-25
user.serverless.stage.a.extra.app 1 2026-02-12 2026-02-12
persona-adapter.serverless.stage.a.extra.app 1 2026-01-26 2026-01-26
gateway.serverless.stage.a.extra.app 1 2026-02-12 2026-02-12
mtc-885-sms-page.dev.a.extra.app 2 2026-03-18 2026-08-18
api.mtc-885-sms-page.dev.a.extra.app 2 2026-03-19 2026-08-19
sst-stage.dev.a.extra.app 1 2026-02-09 2026-02-09
api.sst-stage.dev.a.extra.app 1 2026-02-11 2026-02-11
user.dev.a.extra.app 2 2026-02-22 2026-07-10
*.budgetballerz.a.extra.app 2 2025-11-13 2025-11-13
budget-service-go.budgetballerz.a.extra.app 1 2025-11-18 2025-11-18
cskb.extra.app 14 2026-05-02 2026-08-28
pci-embed.extra.app 5 2026-05-13 2026-09-13
pii-embed.extra.app 3 2026-06-13 2026-08-14
*.prod.extra.app 12 2026-04-16 2026-10-10
unsubscribe.extra.app 1 2026-07-15 2026-07-15
*.staging.extra.app 12 2026-05-01 2026-08-27
*.dash.extra.app 12 2026-05-01 2026-08-27
*.dataplane.rudderstack.extra.app 12 2026-04-28 2026-08-24
portal.extra.app 4 2026-04-17 2026-08-20
go.extra.app 5 2026-05-15 2026-09-12
mmo.extra.app 5 2026-05-28 2026-09-24
card-hop.extra.app 3 2026-06-15 2026-08-15
*.lunar.extra.app 12 2026-05-01 2026-08-27
s.extra.app 7 2026-05-05 2026-09-02
*.rudderlabs.extra.app 12 2026-04-28 2026-08-24
docs.extra.app 5 2026-04-28 2026-08-26
links.extra.app 3 2026-06-07 2026-08-22
status.extra.app 5 2026-05-04 2026-09-01
gem-heist.extra.app 5 2026-05-28 2026-09-30
rbov4acy.extra.app 5 2026-05-02 2026-08-26
sentry.extra.app 4 2026-05-11 2026-09-23

Programmatic access: API GET /v1/hosts/extra.app (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/extra.app.