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 · 241 ms

HostCertsFirst seenLast seen
greenfield.com 45 2025-07-15 2026-10-01
*.greenfield.com 23 2025-07-15 2026-10-01
hybrid.greenfield.com 4 2025-07-18 2026-07-29
filehubprod.greenfield.com 1 2026-08-25 2026-08-25
ca.estore.greenfield.com 5 2026-05-09 2026-09-06
us.estore.greenfield.com 7 2026-05-05 2026-09-02
servicedesk.greenfield.com 10 2026-04-22 2026-08-18
mail.greenfield.com 4 2025-07-18 2026-07-29
www.mail.greenfield.com 4 2025-07-18 2026-07-29
webmail.greenfield.com 4 2025-07-18 2026-07-29
sl.greenfield.com 4 2026-04-21 2026-08-19
filehubcrptrn.greenfield.com 1 2026-08-25 2026-08-25
go.greenfield.com 9 2026-04-19 2026-09-16
autodiscover.greenfield.com 4 2025-07-18 2026-07-29
sitestatus.greenfield.com 1 2026-02-14 2026-02-14
autodiscover.news.greenfield.com 4 2025-07-18 2026-07-29
test.greenfield.com 7 2026-05-18 2026-09-11
www.greenfield.com 11 2026-05-21 2026-09-08
my.greenfield.com 2 2025-07-04 2026-07-06
app-my.greenfield.com 2 2025-07-04 2026-07-06
university.greenfield.com 2 2025-06-22 2026-05-23

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