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.

38 hosts · 247 ms

HostCertsFirst seenLast seen
topstep.com 15 2025-11-11 2026-09-22
*.topstep.com 6 2025-07-02 2026-06-01
trm-staging1.topstep.com 2 2026-05-25 2026-05-25
grafana.topstep.com 2 2025-07-01 2026-06-01
trm-crystal-qa.topstep.com 1 2026-01-04 2026-01-04
brand.topstep.com 1 2025-12-17 2025-12-17
dashboard.topstep.com 3 2026-04-19 2026-06-18
qa-dashboard.topstep.com 2 2026-05-18 2026-05-18
e.topstep.com 10 2026-05-05 2026-08-31
stage.topstep.com 3 2025-10-17 2026-09-17
*.stage.topstep.com 3 2025-10-17 2026-09-17
scimbridge.topstep.com 26 2026-05-03 2026-07-08
emailtracking.topstep.com 5 2026-05-29 2026-09-26
blog.topstep.com 14 2026-05-05 2026-09-01
team.topstep.com 3 2026-04-28 2026-08-14
go.topstep.com 4 2026-04-20 2026-09-05
crypto.topstep.com 6 2026-06-25 2026-08-24
shop.topstep.com 17 2026-05-21 2026-09-29
*.futures.topstep.com 2 2025-10-21 2026-09-21
strapi-cms.topstep.com 4 2026-04-14 2026-08-12
predictions.topstep.com 2 2026-07-30 2026-07-30
products.topstep.com 1 2026-02-06 2026-02-06
*.products.topstep.com 1 2026-02-06 2026-02-06
www.products.topstep.com 1 2026-02-06 2026-02-06
status.topstep.com 5 2026-06-01 2026-09-28
predict.topstep.com 5 2026-07-30 2026-09-27
intranet.topstep.com 3 2026-05-18 2026-09-03
smart.topstep.com 3 2026-06-24 2026-08-24
test.topstep.com 2 2025-10-17 2026-09-17
*.test.topstep.com 3 2025-10-17 2026-09-17
dev.topstep.com 1 2025-10-15 2025-10-15
trm-crystal-dev.topstep.com 2 2025-09-29 2025-09-29
*.dev.topstep.com 2 2025-10-15 2026-07-01
dashboard.dev.topstep.com 2 2026-05-09 2026-05-09
*.internal.dev.topstep.com 2 2026-08-28 2026-08-28
www.topstep.com 11 2026-05-26 2026-09-22
*.fx.topstep.com 1 2026-01-02 2026-01-02
projectx.topstep.com 4 2026-04-11 2026-08-10

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