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.

27 hosts · 247 ms

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HostCertsFirst seenLast seen
split.io 15 2025-12-09 2026-08-20
*.split.io 11 2025-12-09 2026-09-08
arcade.split.io 4 2026-06-13 2026-10-10
free-arcade.split.io 4 2026-06-10 2026-10-05
sdk-secure.split.io 1 2025-12-09 2025-12-09
groove.split.io 6 2026-06-14 2026-10-14
streaming.split.io 10 2025-08-31 2025-12-12
internal-streaming.split.io 26 2026-03-25 2026-03-25
*.streaming.split.io 3 2025-08-31 2025-08-31
learning.split.io 4 2026-06-13 2026-10-10
api.split.io 1 2025-12-12 2025-12-12
gsnlink.split.io 1 2025-12-18 2025-12-18
pritunl.split.io 3 2026-05-19 2026-08-08
cdn.split.io 1 2025-09-08 2025-09-08
on.split.io 5 2026-04-29 2026-09-14
go.split.io 10 2026-05-07 2026-09-02
help.split.io 4 2026-06-13 2026-10-10
docs.split.io 9 2026-06-09 2026-10-05
sales.split.io 4 2026-04-21 2026-08-19
status.split.io 4 2026-06-10 2026-10-07
*.barclays.split.io 5 2026-02-20 2026-08-27
streaming.barclays.split.io 13 2026-04-07 2026-04-07
sdk.barclays.split.io 1 2026-03-03 2026-03-03
get.split.io 16 2026-05-08 2026-09-04
*.eu.split.io 4 2026-03-23 2026-08-23
streaming.eu.split.io 13 2026-02-23 2026-02-23
www.split.io 16 2026-04-25 2026-08-21

Programmatic access: API GET /v1/hosts/split.io (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/split.io.