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.

16 hosts · 211 ms

HostCertsFirst seenLast seenDNS
thesmallbusinessexpo.com 16 2025-08-27 2026-09-27 ok
*.thesmallbusinessexpo.com 11 2025-08-05 2026-09-27 —
sbe.thesmallbusinessexpo.com 3 2026-07-08 2026-09-23 ok
knowledgebase.thesmallbusinessexpo.com 8 2026-05-13 2026-09-08 ok
cf.thesmallbusinessexpo.com 21 2026-06-03 2026-09-29 ok
staging.thesmallbusinessexpo.com 5 2026-04-26 2026-08-26 ok
blog.thesmallbusinessexpo.com 6 2025-06-09 2026-09-03 ok
www.blog.thesmallbusinessexpo.com 5 2026-05-04 2026-09-03 ok
portal.thesmallbusinessexpo.com 8 2026-04-12 2026-08-10 ok
cpanel.thesmallbusinessexpo.com 5 2026-04-28 2026-08-28 ok
info.thesmallbusinessexpo.com 6 2026-05-01 2026-08-27 ok
go.thesmallbusinessexpo.com 5 2026-05-19 2026-09-18 ok
www.go.thesmallbusinessexpo.com 5 2026-05-19 2026-09-18 ok
sst.thesmallbusinessexpo.com 4 2026-06-07 2026-10-05 ok
www.thesmallbusinessexpo.com 5 2026-04-28 2026-08-28 ok
sbx.thesmallbusinessexpo.com 6 2026-07-09 2026-09-06 ok

Programmatic access, with DNS A records: API GET /v1/hosts/thesmallbusinessexpo.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/thesmallbusinessexpo.com.