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.

49 hosts · 282 ms

HostCertsFirst seenLast seen
monopolygo.com 3 2025-10-01 2026-09-01
*.sandbox20.monopolygo.com 4 2026-08-31 2026-08-31
*.sandbox30.monopolygo.com 2 2026-07-20 2026-07-20
*.sandbox50.monopolygo.com 3 2026-05-18 2026-07-20
*.sandbox11.monopolygo.com 4 2026-09-16 2026-09-16
*.sandbox21.monopolygo.com 8 2026-08-31 2026-09-01
*.sandbox51.monopolygo.com 2 2026-09-11 2026-09-11
*.sandbox52.monopolygo.com 4 2026-09-14 2026-09-14
*.qa2.monopolygo.com 7 2026-05-15 2026-06-17
*.stage2.monopolygo.com 6 2026-05-15 2026-06-17
*.sandbox13.monopolygo.com 12 2026-05-15 2026-08-21
*.sandbox53.monopolygo.com 4 2026-09-15 2026-09-15
*.sandbox14.monopolygo.com 2 2026-07-16 2026-07-16
*.sandbox45.monopolygo.com 4 2026-07-27 2026-07-27
*.sandbox47.monopolygo.com 5 2026-06-15 2026-06-15
*.sandbox18.monopolygo.com 4 2026-07-09 2026-07-09
*.sandbox48.monopolygo.com 13 2026-06-03 2026-06-05
*.sandbox29.monopolygo.com 4 2026-10-05 2026-10-05
web-qa.monopolygo.com 2 2026-06-23 2026-06-23
e2e.web-qa.monopolygo.com 1 2026-10-07 2026-10-07
ci.web-qa.monopolygo.com 3 2026-09-15 2026-09-15
*.qa.monopolygo.com 8 2026-05-15 2026-06-17
e2e.qa.monopolygo.com 1 2026-10-07 2026-10-07
*.rc.monopolygo.com 5 2026-05-15 2026-06-17
*.prod.monopolygo.com 5 2026-05-15 2026-06-16
*.preprod.monopolygo.com 3 2026-05-15 2026-05-21
web-stage.monopolygo.com 1 2026-06-23 2026-06-23
ci.web-stage.monopolygo.com 3 2026-09-15 2026-09-15
*.stage.monopolygo.com 6 2026-05-15 2026-06-17
*.liveops.monopolygo.com 2 2026-07-16 2026-07-16
news.monopolygo.com 2 2025-10-01 2026-09-01
link.news.monopolygo.com 2 2025-10-21 2026-09-21
gochat.monopolygo.com 2 2026-02-19 2026-07-22
dev.gochat.monopolygo.com 4 2026-01-28 2026-09-02
support.monopolygo.com 2 2026-05-11 2026-09-08
*.support.monopolygo.com 2 2026-05-11 2026-09-08
stage.support.monopolygo.com 2 2025-08-22 2026-07-23
*.stage.support.monopolygo.com 2 2025-08-22 2026-07-23
test.api.support.monopolygo.com 2 2026-04-27 2026-09-27
dev.api.support.monopolygo.com 2 2026-04-27 2026-09-27
test.support.monopolygo.com 4 2026-04-27 2026-09-27
*.test.support.monopolygo.com 4 2026-04-27 2026-09-27
dev.support.monopolygo.com 4 2026-04-27 2026-09-27
*.dev.support.monopolygo.com 4 2026-04-27 2026-09-27
*.loadtest.monopolygo.com 6 2026-06-09 2026-06-11
dev.monopolygo.com 3 2025-12-11 2026-09-02
e2e.dev.monopolygo.com 1 2026-10-07 2026-10-07
ci.dev.monopolygo.com 2 2026-09-02 2026-09-02
www.monopolygo.com 1 2026-01-12 2026-01-12

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