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.

25 hosts · 284 ms

HostCertsFirst seenLast seenDNS
reserved.com 5 2026-03-17 2026-08-03 ok
*.reserved.com 8 2026-03-17 2026-09-11 —
a.reserved.com 3 2026-06-02 2026-08-16 ok
media.reserved.com 3 2026-04-12 2026-10-03 ok
links.message.reserved.com 4 2026-04-12 2026-08-12 ok
link-stage.reserved.com 4 2026-07-15 2026-10-03 ok
go-stage.reserved.com 4 2026-04-30 2026-07-19 ok
lp-stage.reserved.com 3 2026-06-16 2026-09-04 ok
gb-api.reserved.com 2 2026-06-11 2026-09-06 ok
link.reserved.com 3 2026-07-15 2026-10-03 ok
welcome2dreamcore-men.reserved.com 10 2026-04-18 2026-08-15 ok
welcome2dreamcore-women.reserved.com 10 2026-04-18 2026-08-14 ok
join.reserved.com 6 2026-04-14 2026-09-22 ok
go.reserved.com 4 2026-04-30 2026-07-19 ok
lp.reserved.com 4 2026-06-16 2026-09-04 ok
sms.reserved.com 5 2026-05-10 2026-09-25 ok
css.reserved.com 5 2026-05-16 2026-09-14 ok
www.css.reserved.com 5 2026-05-16 2026-09-14 ok
news.reserved.com 4 2026-06-02 2026-10-06 ok
multimedia.news.reserved.com 4 2026-06-02 2026-10-06 ok
www.news.reserved.com 4 2026-06-02 2026-10-06 ok
visit.reserved.com 3 2026-06-02 2026-08-16 ok
sst.reserved.com 3 2026-05-17 2026-08-30 ok
lp-dev.reserved.com 4 2026-05-07 2026-07-26 ok
redesignbygenz.reserved.com 4 2026-05-11 2026-09-02 ok

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