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.

24 hosts · 364 ms

HostCertsFirst seenLast seenDNS
nagaku.com 2 2025-09-09 2026-08-10 ok
echo-v2.nagaku.com 1 2026-06-17 2026-06-17 ok
console.nagaku.com 3 2026-04-27 2026-09-27 ok
omakase.nagaku.com 5 2026-04-17 2026-09-26 ok
mag.nagaku.com 5 2026-05-26 2026-09-24 ok
workbench.nagaku.com 2 2025-11-02 2026-07-22 ok
fetch.nagaku.com 1 2026-06-09 2026-06-09 ok
dwh.nagaku.com 1 2026-06-22 2026-06-22 ok
api.nagaku.com 3 2026-04-27 2026-09-27 ok
hook.nagaku.com 2 2025-07-29 2026-06-29 ok
click.mail.nagaku.com 1 2026-07-16 2026-07-16 ok
crawl.nagaku.com 1 2026-09-17 2026-09-17 nodata
echo.nagaku.com 2 2026-02-24 2026-07-12 ok
neko.nagaku.com 2 2025-07-28 2026-06-12 ok
help.nagaku.com 5 2026-05-19 2026-09-16 ok
corp.nagaku.com 5 2026-05-26 2026-09-23 ok
sts.nagaku.com 1 2026-06-16 2026-06-16 ok
robot.nagaku.com 1 2026-07-02 2026-07-02 ok
dev.nagaku.com 3 2026-04-27 2026-09-27 ok
console.dev.nagaku.com 3 2026-04-27 2026-09-27 ok
api.dev.nagaku.com 3 2026-04-27 2026-09-27 ok
hook.dev.nagaku.com 2 2025-07-29 2026-06-29 ok
click.mail.dev.nagaku.com 1 2026-07-16 2026-07-16 ok
neko.dev.nagaku.com 1 2026-06-10 2026-06-10 ok

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