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.

34 hosts · 217 ms

HostCertsFirst seenLast seen
ostrom.de 9 2026-05-19 2026-09-14
*.ostrom.de 3 2025-12-07 2026-02-19
eheizung24.ostrom.de 6 2026-05-04 2026-07-02
n26.ostrom.de 8 2026-05-03 2026-08-29
midea.ostrom.de 2 2026-09-07 2026-09-07
voltara.ostrom.de 14 2026-04-19 2026-08-16
provinzial-service.ostrom.de 6 2026-05-06 2026-07-04
one.ostrom.de 2 2026-09-07 2026-09-07
store.ostrom.de 15 2026-04-15 2026-09-26
bullfinch.ostrom.de 6 2026-04-29 2026-08-25
queitsch.ostrom.de 6 2026-05-09 2026-09-04
solarpol.ostrom.de 6 2026-05-06 2026-07-04
adsol.ostrom.de 6 2026-04-25 2026-08-21
calosol.ostrom.de 8 2026-06-11 2026-08-09
autarkie-zentrum.ostrom.de 10 2026-04-15 2026-08-11
energieversum.ostrom.de 10 2026-05-20 2026-09-16
solarhelden.ostrom.de 6 2026-05-06 2026-07-05
stadtwerke-boeblingen.ostrom.de 8 2026-05-28 2026-09-24
stadtwerke-kerpen.ostrom.de 9 2026-05-27 2026-09-22
solaraero.ostrom.de 4 2026-05-06 2026-07-04
oberursel-solar.ostrom.de 8 2026-04-14 2026-08-10
mauro-solar.ostrom.de 12 2026-04-30 2026-08-27
mpgsolar.ostrom.de 10 2026-04-14 2026-08-11
turnsolar.ostrom.de 4 2026-05-04 2026-07-02
infrapower.ostrom.de 4 2026-05-04 2026-07-02
metrics.ostrom.de 4 2026-06-03 2026-09-20
alphaess.ostrom.de 9 2026-05-18 2026-09-13
focus.ostrom.de 8 2026-04-27 2026-08-23
status.ostrom.de 16 2026-05-22 2026-09-26
ai-toolkit.ostrom.de 1 2026-10-09 2026-10-09
vaillant.ostrom.de 13 2026-05-30 2026-09-25
support.ostrom.de 10 2026-05-07 2026-09-03
www.ostrom.de 10 2026-05-12 2026-09-07
soly.ostrom.de 8 2026-05-06 2026-09-01

Programmatic access: API GET /v1/hosts/ostrom.de (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/ostrom.de.