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.

30 hosts · 270 ms

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HostCertsFirst seenLast seen
tsia.com 18 2026-02-08 2026-10-14
*.tsia.com 6 2026-04-30 2026-10-14
email.conference.tsia.com 3 2026-07-06 2026-09-04
auth.tsia.com 10 2026-04-30 2026-08-27
gsnlink.tsia.com 1 2025-07-23 2025-07-23
portal.tsia.com 5 2026-04-25 2026-08-28
api.portal.tsia.com 14 2026-05-28 2026-09-23
video.portal.tsia.com 13 2026-04-29 2026-10-13
*.video.portal.tsia.com 21 2026-04-29 2026-10-13
cfcdn.video.portal.tsia.com 14 2026-06-14 2026-10-11
*.cfcdn.video.portal.tsia.com 14 2026-06-14 2026-10-11
*.edgemv.video.portal.tsia.com 5 2026-04-29 2026-09-30
*.fastly.video.portal.tsia.com 8 2026-06-27 2026-10-05
partnerportal.tsia.com 1 2025-12-17 2025-12-17
email.mail.tsia.com 5 2026-05-20 2026-09-17
data.pendo.tsia.com 4 2026-05-30 2026-09-15
content.pendo.tsia.com 4 2026-06-01 2026-09-17
cloud.hello.tsia.com 3 2025-09-27 2026-09-15
image.hello.tsia.com 3 2025-11-05 2026-01-28
click.hello.tsia.com 1 2025-11-09 2025-11-09
view.hello.tsia.com 1 2025-11-09 2025-11-09
invites.tsia.com 1 2026-03-11 2026-03-11
sfs.tsia.com 5 2026-04-26 2026-08-28
suggestions.tsia.com 5 2026-05-05 2026-09-02
email.success.tsia.com 3 2026-07-06 2026-09-04
payments.tsia.com 5 2026-04-26 2026-08-29
trust.tsia.com 10 2026-06-14 2026-10-10
auth.dev.tsia.com 2 2026-10-13 2026-10-13
webflow.tsia.com 8 2026-05-02 2026-08-28
www.tsia.com 6 2026-05-06 2026-09-01

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