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.

39 hosts · 251 ms

HostCertsFirst seenLast seen
step.com 5 2026-05-01 2026-10-09
static.step.com 3 2026-05-16 2026-09-01
brand.step.com 5 2026-06-05 2026-10-04
ota-update.step.com 5 2026-04-30 2026-10-05
pf.step.com 5 2026-04-27 2026-10-06
stg.step.com 4 2026-05-31 2026-09-16
ota-update.stg.step.com 3 2026-05-07 2026-08-25
api.stg.step.com 4 2026-05-31 2026-09-16
admin.stg.step.com 4 2026-05-31 2026-09-16
help.stg.step.com 4 2026-05-31 2026-09-16
branch.step.com 3 2026-06-01 2026-08-16
csgi.step.com 4 2026-06-07 2026-09-23
api.step.com 5 2026-05-01 2026-10-09
videoask.step.com 5 2026-05-19 2026-09-16
link.mail.step.com 3 2026-06-17 2026-09-01
ablink.mail.step.com 6 2026-04-21 2026-10-05
admin.step.com 5 2026-05-01 2026-10-09
join.step.com 5 2026-04-25 2026-09-24
learn.step.com 24 2026-04-16 2026-09-03
help.step.com 5 2026-05-01 2026-10-09
shop.step.com 4 2026-06-04 2026-09-24
qr.step.com 3 2026-05-04 2026-08-24
logos.step.com 4 2026-05-26 2026-09-15
pps.step.com 3 2026-05-16 2026-08-31
assets.step.com 4 2026-04-27 2026-10-07
merchants.step.com 3 2026-05-14 2026-08-31
status.step.com 5 2026-05-14 2026-08-26
get.step.com 12 2026-05-03 2026-08-29
branch-test.step.com 5 2026-04-29 2026-09-28
join-test.step.com 5 2026-04-25 2026-09-24
get-test.step.com 16 2026-05-04 2026-08-30
text.step.com 12 2026-04-28 2026-08-24
dev.step.com 4 2026-06-04 2026-09-18
ota-update.dev.step.com 3 2026-05-03 2026-08-16
api.dev.step.com 4 2026-06-04 2026-09-18
ablink.mail.dev.step.com 5 2026-04-23 2026-10-06
admin.dev.step.com 4 2026-06-04 2026-09-18
help.dev.step.com 4 2026-06-04 2026-09-18
www.step.com 4 2026-04-30 2026-10-08

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