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.

13 hosts · 275 ms

HostCertsFirst seenLast seenDNS
assumelist.com 23 2026-05-02 2026-10-06 ok
*.assumelist.com 18 2026-05-22 2026-10-06 —
homes2.assumelist.com 7 2026-04-10 2026-08-08 ok
email.lc.assumelist.com 5 2026-05-23 2026-09-20 ok
staging.assumelist.com 2 2026-05-19 2026-05-19 ok
www.staging.assumelist.com 3 2026-05-19 2026-08-14 ok
api.assumelist.com 20 2026-05-29 2026-09-27 ok
link.assumelist.com 5 2026-06-04 2026-10-02 ok
apijobs.assumelist.com 4 2026-06-03 2026-08-02 ok
homes.assumelist.com 4 2026-05-26 2026-07-25 ok
support.assumelist.com 9 2026-05-20 2026-09-16 ok
www.assumelist.com 5 2026-05-02 2026-08-31 ok
kwaz.assumelist.com 5 2026-05-02 2026-08-31 ok

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