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.

21 hosts · 224 ms

HostCertsFirst seenLast seen
szl.ai 7 2026-04-14 2026-10-06
*.szl.ai 4 2026-09-09 2026-10-02
web.szl.ai 2 2026-04-11 2026-09-11
internal-web.szl.ai 2 2026-04-09 2026-09-09
invite.szl.ai 2 2025-08-18 2026-07-19
api.szl.ai 1 2025-12-08 2025-12-08
internal-api.szl.ai 3 2026-03-30 2026-08-30
dev-api.szl.ai 1 2025-12-28 2025-12-28
internal-dev-api.szl.ai 3 2026-03-29 2026-08-29
link.szl.ai 5 2026-04-29 2026-09-27
go.szl.ai 9 2026-04-18 2026-09-15
gcp.szl.ai 6 2026-09-05 2026-10-02
*.gcp.szl.ai 6 2026-09-05 2026-10-02
course-copilot.szl.ai 1 2026-02-04 2026-02-04
internal-course-copilot.szl.ai 1 2026-02-04 2026-02-04
dev-course-copilot.szl.ai 1 2026-09-01 2026-09-01
internal-dev-course-copilot.szl.ai 2 2026-04-07 2026-09-07
web-dev.szl.ai 2 2026-04-12 2026-09-12
internal-web-dev.szl.ai 2 2026-04-12 2026-09-12
invite-dev.szl.ai 2 2025-08-19 2026-07-20
www.szl.ai 3 2026-04-25 2026-09-25

Programmatic access: API GET /v1/hosts/szl.ai (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/szl.ai.