Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

25 hosts · 270 ms

HostCertsFirst seenLast seenDNS
sweep.io 5 2025-06-18 2026-09-24 ok
*.sweep.io 5 2025-06-18 2026-01-05 —
backend.sweep.io 2 2026-02-22 2026-07-10 ok
eevee-staging.sweep.io 2 2025-08-20 2026-07-21 nodata
*.eevee-staging.sweep.io 4 2025-08-20 2026-07-21 —
branch-staging.sweep.io 2 2025-07-30 2026-06-30 nodata
*.branch-staging.sweep.io 4 2025-07-29 2026-06-30 —
*.pikachu-staging.sweep.io 1 2026-07-23 2026-07-23 —
*.staging.sweep.io 2 2025-12-10 2025-12-10 —
marketing.sweep.io 10 2026-05-15 2026-09-11 ok
auth.sweep.io 10 2026-04-30 2026-08-27 ok
staging.auth.sweep.io 10 2026-04-30 2026-08-27 ok
api.sweep.io 1 2025-12-05 2025-12-05 ok
email.sweep.io 5 2026-04-26 2026-08-24 ok
demo.sweep.io 2 2026-06-29 2026-06-29 nxdomain
help.sweep.io 12 2026-04-22 2026-08-19 ok
*.app.sweep.io 1 2026-01-04 2026-01-04 —
tour.sweep.io 6 2026-07-09 2026-09-06 ok
labs.sweep.io 8 2026-05-07 2026-09-02 ok
workspaces.sweep.io 3 2026-07-23 2026-09-23 ok
wss.sweep.io 2 2025-10-14 2026-09-14 ok
au.sweep.io 1 2026-09-27 2026-09-27 nodata
*.au.sweep.io 2 2026-09-24 2026-09-27 —
auth.au.sweep.io 2 2026-09-24 2026-09-24 ok
www.sweep.io 12 2026-05-17 2026-09-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sweep.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/sweep.io.