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 · 530 ms

HostCertsFirst seenLast seenDNS
median.co 55 2026-04-08 2026-09-28 ok
*.median.co 18 2026-05-01 2026-09-13 —
test2.median.co 5 2026-06-04 2026-10-02 ok
admin-test2.median.co 2 2026-05-01 2026-05-01 ok
admin.test2.median.co 2 2026-05-01 2026-05-01 nxdomain
static.median.co 8 2026-04-23 2026-08-20 ok
license.median.co 6 2026-04-23 2026-09-28 ok
quote.median.co 12 2026-04-07 2026-10-01 ok
staging.median.co 8 2026-04-19 2026-08-15 ok
reporting.median.co 4 2026-04-30 2026-08-22 ok
email.median.co 16 2026-04-07 2026-10-01 ok
npm.median.co 9 2026-04-18 2026-08-14 ok
cdn.median.co 6 2026-05-07 2026-09-01 ok
sign.median.co 2 2026-09-23 2026-09-23 ok
*.sign.median.co 2 2026-09-23 2026-09-23 —
admin.median.co 1 2026-06-16 2026-06-16 ok
mcp.median.co 1 2026-09-28 2026-09-28 ok
docs.median.co 11 2026-05-23 2026-09-19 ok
packages.median.co 10 2026-05-26 2026-09-23 ok
images.median.co 13 2026-06-04 2026-10-01 ok
templates.median.co 4 2026-04-18 2026-08-18 ok
mta-sts.median.co 2 2026-09-17 2026-09-17 ok
*.mta-sts.median.co 2 2026-09-17 2026-09-17 —
status.median.co 5 2026-05-14 2026-09-12 ok
connect.median.co 15 2026-04-09 2026-10-03 ok
test.median.co 5 2026-05-30 2026-08-23 ok
mcp-test.median.co 3 2026-06-23 2026-08-23 ok
preview.median.co 8 2026-04-19 2026-09-14 ok
*.preview.median.co 4 2026-07-17 2026-09-14 —
pay.median.co 12 2026-04-23 2026-08-20 ok

Programmatic access, with DNS A records: API GET /v1/hosts/median.co (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/median.co.