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.

44 hosts · 177 ms

HostCertsFirst seenLast seen
fortum.fi 8 2026-04-17 2026-09-11
identiteettisuoja.fortum.fi 3 2025-08-11 2026-08-10
yrvarma.fortum.fi 3 2026-04-15 2026-10-05
yhdessa.fortum.fi 6 2026-05-02 2026-08-28
xn--yhdess-gua.fortum.fi 16 2026-05-02 2026-08-28
b.fortum.fi 2 2026-02-12 2026-07-05
b2b.fortum.fi 8 2026-05-17 2026-09-12
web.fortum.fi 4 2026-03-24 2026-09-16
www.web.fortum.fi 4 2026-03-24 2026-09-16
c.fortum.fi 2 2026-02-13 2026-07-07
metabaseprod.fortum.fi 1 2025-11-07 2025-11-07
appsprod.fortum.fi 3 2026-04-15 2026-10-05
welcome.fortum.fi 2 2026-02-09 2026-07-04
online.fortum.fi 1 2026-06-15 2026-06-15
heatonline.fortum.fi 2 2026-05-17 2026-10-01
staging.fortum.fi 5 2026-05-16 2026-09-12
vahti.fortum.fi 4 2026-05-20 2026-10-02
powerportal.fortum.fi 2 2026-02-16 2026-02-16
avtal.fortum.fi 3 2026-04-15 2026-10-05
elavtal.fortum.fi 3 2026-04-15 2026-10-05
design.fortum.fi 3 2026-05-25 2026-10-06
on.fortum.fi 4 2026-05-08 2026-07-07
info.fortum.fi 8 2026-05-03 2026-08-29
kesto.fortum.fi 3 2026-04-15 2026-10-05
svekesto.fortum.fi 3 2026-04-15 2026-10-05
asiakas.fortum.fi 3 2026-04-15 2026-10-05
cms.fortum.fi 12 2026-05-13 2026-09-13
apps.fortum.fi 3 2026-03-25 2026-09-16
mta-sts.fortum.fi 5 2026-05-24 2026-09-21
proplus.fortum.fi 3 2026-03-25 2026-09-16
testproplus.fortum.fi 4 2026-03-25 2026-09-16
sopimus.fortum.fi 3 2026-04-15 2026-10-05
yritys.fortum.fi 1 2025-11-10 2025-11-10
kampanjat.fortum.fi 6 2026-05-02 2026-08-28
heatonlineuat.fortum.fi 3 2026-05-14 2026-09-27
metabasetest.fortum.fi 1 2025-11-07 2025-11-07
appstest.fortum.fi 4 2026-03-25 2026-09-16
takuu.fortum.fi 3 2026-04-15 2026-10-05
yrtakuu.fortum.fi 3 2026-04-15 2026-10-05
dev.fortum.fi 4 2026-06-09 2026-10-06
www.fortum.fi 1 2026-04-17 2026-04-17
hyvaksy.fortum.fi 3 2026-04-15 2026-10-05
identity.fortum.fi 3 2026-03-25 2026-09-16
testidentity.fortum.fi 4 2026-03-25 2026-09-16

Programmatic access: API GET /v1/hosts/fortum.fi (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/fortum.fi.