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 · 333 ms

HostCertsFirst seenLast seenDNS
rakumachi.jp 12 2026-06-24 2026-08-31 ok
*.rakumachi.jp 12 2026-06-24 2026-08-31 —
stage2.rakumachi.jp 1 2025-12-16 2025-12-16 ok
stage3.rakumachi.jp 1 2025-12-17 2025-12-17 ok
dev-news-origin-alb.rakumachi.jp 1 2025-12-09 2025-12-09 nxdomain
tosi-prod.rakumachi.jp 2 2026-08-17 2026-08-17 nodata
landprice.rakumachi.jp 4 2025-10-21 2026-09-21 ok
file.rakumachi.jp 2 2025-07-20 2026-06-20 ok
dev-news-origin-cf.rakumachi.jp 1 2025-12-09 2025-12-09 nxdomain
dev-news-cf.rakumachi.jp 2 2025-12-09 2025-12-09 ok
img.rakumachi.jp 1 2025-11-23 2025-11-23 ok
billing.rakumachi.jp 1 2025-11-30 2025-11-30 ok
tosi-stg.rakumachi.jp 1 2026-07-02 2026-07-02 ok
ask-stg.rakumachi.jp 1 2026-09-07 2026-09-07 ok
aehudh.rakumachi.jp 4 2026-05-28 2026-08-01 ok
rundeck.rakumachi.jp 1 2026-01-08 2026-01-08 ok
link.rakumachi.jp 5 2026-04-18 2026-10-06 ok
webhook.rakumachi.jp 1 2025-11-29 2025-11-29 ok
ask.rakumachi.jp 5 2026-05-27 2026-09-28 ok
ad-script-check-tool.rakumachi.jp 4 2026-04-17 2026-08-18 ok
sgtm.rakumachi.jp 6 2026-04-23 2026-10-01 ok
origin.rakumachi.jp 6 2026-05-03 2026-08-29 ok
dev-news-origin.rakumachi.jp 1 2025-12-03 2025-12-03 nxdomain
yahoo-promotion.rakumachi.jp 1 2025-11-28 2025-11-28 ok
criteo.rakumachi.jp 2 2025-11-03 2026-10-04 ok
tosi-stg-lp.rakumachi.jp 1 2026-07-21 2026-07-21 ok
links.rakumachi.jp 14 2026-05-15 2026-09-11 ok
wp-products.rakumachi.jp 2 2025-12-16 2025-12-16 ok
news.rakumachi.jp 2 2026-01-29 2026-01-29 ok
www.rakumachi.jp 2 2026-08-17 2026-08-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/rakumachi.jp (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/rakumachi.jp.