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.

30 hosts · 379 ms

HostCertsFirst seenLast seenDNS
strato.se 2 2025-07-22 2026-08-12 ok
acn2.strato.se 6 2026-03-12 2026-08-12 ok
oc.strato.se 1 2026-08-31 2026-08-31 ok
hed.strato.se 1 2026-01-19 2026-01-19 ok
id.strato.se 3 2026-05-05 2026-05-05 ok
z6aund.strato.se 1 2026-01-20 2026-01-20 ok
presence.strato.se 1 2026-05-04 2026-05-04 ok
hosting.strato.se 2 2026-06-26 2026-06-29 nxdomain
api.hosting.strato.se 2 2026-06-26 2026-06-29 nxdomain
rankingcoach.strato.se 1 2025-09-30 2025-09-30 ok
ai.strato.se 1 2026-06-16 2026-06-16 ok
*.ai.strato.se 1 2026-06-16 2026-06-16 —
acn.strato.se 6 2025-08-24 2026-07-26 ok
ecp.strato.se 3 2025-06-10 2026-08-31 nxdomain
*.ecp.strato.se 3 2026-06-05 2026-08-31 —
ai-builder.strato.se 2 2026-06-26 2026-06-29 ok
preview.ai-builder.strato.se 1 2026-06-29 2026-06-29 ok
*.preview.ai-builder.strato.se 1 2026-06-29 2026-06-29 —
sitebuilder.strato.se 1 2026-05-04 2026-05-04 ok
customer-manager.strato.se 3 2026-09-17 2026-09-17 nodata
*.customer-manager.strato.se 3 2026-09-17 2026-09-17 —
ias.strato.se 5 2025-08-26 2026-08-21 ok
templates.strato.se 1 2026-05-04 2026-05-04 ok
surveys.strato.se 1 2026-05-27 2026-05-27 ok
phishing-contact.strato.se 2 2025-08-18 2026-08-05 ok
qs-phishing-contact.strato.se 2 2025-08-19 2026-08-05 ok
www.phishing-contact.strato.se 2 2025-08-18 2026-08-05 nxdomain
test-phishing.contact.strato.se 2 2025-08-19 2026-08-05 nxdomain
emt.strato.se 1 2025-09-09 2025-09-09 ok
www.strato.se 2 2025-07-22 2026-08-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/strato.se (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/strato.se.