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.

12 hosts · 388 ms

HostCertsFirst seenLast seenDNS
stg-exe.docomosoukin.com 1 2026-01-16 2026-01-16 ok
execute-api.stg-exe.docomosoukin.com 4 2025-09-19 2026-08-20 ok
stg-api-exe.docomosoukin.com 2 2025-09-19 2026-08-20 ok
execute-api.stg.docomosoukin.com 4 2025-09-19 2026-08-20 ok
api.docomosoukin.com 2 2025-09-29 2026-08-30 ok
execute-api.docomosoukin.com 3 2025-09-29 2026-08-30 ok
stg-api.docomosoukin.com 2 2025-09-19 2026-08-20 ok
slackapi.docomosoukin.com 3 2025-09-29 2026-08-30 ok
stg-slackapi.docomosoukin.com 3 2025-09-19 2026-08-20 ok
dev-slackapi.docomosoukin.com 3 2025-09-19 2026-08-20 ok
mnt.docomosoukin.com 1 2026-01-22 2026-01-22 ok
stg-mnt.docomosoukin.com 1 2026-01-16 2026-01-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/docomosoukin.com (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/docomosoukin.com.