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.

24 hosts · 251 ms

HostCertsFirst seenLast seen
standardmetrics.io 134 2026-04-18 2026-10-04
*.standardmetrics.io 14 2026-05-20 2026-09-15
op-scim-bridge.standardmetrics.io 4 2026-04-18 2026-08-16
labsgoogle.standardmetrics.io 5 2026-08-17 2026-09-02
staging.standardmetrics.io 12 2026-05-20 2026-09-15
mcp-staging.standardmetrics.io 6 2026-04-18 2026-08-14
api.staging.standardmetrics.io 12 2026-05-20 2026-09-15
mcp.staging.standardmetrics.io 10 2026-04-18 2026-08-14
auth.standardmetrics.io 12 2026-05-20 2026-09-15
api.standardmetrics.io 12 2026-05-20 2026-09-15
sl.standardmetrics.io 5 2026-04-28 2026-08-26
demo.standardmetrics.io 12 2026-05-20 2026-09-15
mcp-demo.standardmetrics.io 8 2026-04-18 2026-08-14
api.demo.standardmetrics.io 12 2026-05-20 2026-09-15
mcp.demo.standardmetrics.io 10 2026-04-18 2026-08-14
mcp.standardmetrics.io 20 2026-04-18 2026-09-30
app.standardmetrics.io 12 2026-05-20 2026-09-15
labs.standardmetrics.io 6 2026-08-14 2026-09-02
docs.standardmetrics.io 5 2026-05-25 2026-09-27
logos.standardmetrics.io 1 2026-06-05 2026-06-05
excel-assets.standardmetrics.io 10 2026-05-04 2026-08-31
mta-sts.standardmetrics.io 12 2026-06-08 2026-10-04
status.standardmetrics.io 7 2026-05-16 2026-09-23
www.standardmetrics.io 16 2026-04-29 2026-08-25

Programmatic access: API GET /v1/hosts/standardmetrics.io (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/standardmetrics.io.