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.

23 hosts · 321 ms

HostCertsFirst seenLast seenDNS
sumailab.net 3 2026-04-26 2026-09-26 ok
url4037.sumailab.net 1 2025-12-29 2025-12-29 ok
url5949.sumailab.net 1 2025-12-25 2025-12-25 ok
littera.sumailab.net 1 2026-06-24 2026-06-24 ok
paper-web.sumailab.net 2 2025-07-03 2026-06-03 ok
board.sumailab.net 2 2026-03-12 2026-08-12 ok
xforce.sumailab.net 2 2025-07-03 2026-06-03 ok
line.sumailab.net 1 2026-05-13 2026-05-13 ok
incentive.sumailab.net 1 2026-10-01 2026-10-01 ok
img.sumailab.net 1 2026-02-16 2026-02-16 ok
dev-staging.sumailab.net 3 2026-04-19 2026-09-19 ok
img-dev-staging.sumailab.net 1 2026-02-12 2026-02-12 ok
board-stg.sumailab.net 2 2026-03-02 2026-08-02 ok
line-stg.sumailab.net 1 2026-05-13 2026-05-13 ok
incentive-stg.sumailab.net 2 2026-09-28 2026-10-01 nxdomain
crm-stg.sumailab.net 3 2026-04-19 2026-09-19 ok
redash.sumailab.net 2 2025-07-03 2026-06-03 ok
crm.sumailab.net 2 2025-07-03 2026-06-03 ok
saiyo-kid-kun.sumailab.net 1 2026-07-16 2026-07-16 ok
store-management.sumailab.net 1 2026-10-03 2026-10-03 nxdomain
test.sumailab.net 3 2026-04-26 2026-09-26 ok
img-test.sumailab.net 1 2026-02-16 2026-02-16 ok
www.sumailab.net 3 2026-04-26 2026-09-26 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sumailab.net (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/sumailab.net.