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.

15 hosts · 374 ms

HostCertsFirst seenLast seenDNS
achievable.me 57 2025-07-09 2026-10-01 ok
*.achievable.me 12 2025-06-23 2026-10-01 —
achievable-blue.achievable.me 8 2026-04-14 2026-08-10 ok
assets-blue.achievable.me 22 2026-05-14 2026-09-15 ok
blog.achievable.me 3 2026-04-12 2026-08-14 ok
www.blog.achievable.me 3 2026-04-09 2026-08-11 ok
talk.achievable.me 20 2026-04-26 2026-08-25 ok
go.achievable.me 5 2026-06-06 2026-10-02 ok
audio.achievable.me 10 2026-05-20 2026-09-15 nxdomain
develop.achievable.me 4 2026-06-03 2026-10-05 ok
app.achievable.me 4 2026-04-17 2026-08-20 ok
achievable-blue--uat.achievable.me 10 2026-04-15 2026-08-11 ok
blog-next.achievable.me 5 2026-05-11 2026-09-12 ok
www.achievable.me 5 2026-05-12 2026-09-14 ok
ux.achievable.me 5 2026-05-05 2026-09-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/achievable.me (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/achievable.me.