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 · 274 ms

HostCertsFirst seenLast seenDNS
startsteps.org 5 2026-04-23 2026-08-25 ok
jobboard.startsteps.org 6 2026-06-01 2026-10-04 ok
guide.startsteps.org 5 2026-05-05 2026-09-06 ok
staging.startsteps.org 4 2026-04-11 2026-08-09 ok
ai.startsteps.org 5 2026-04-23 2026-08-25 ok
ewm.startsteps.org 5 2026-06-02 2026-10-04 ok
futurewomen.startsteps.org 5 2026-05-24 2026-09-25 ok
application.startsteps.org 11 2026-04-11 2026-10-05 ok
sap.startsteps.org 5 2026-04-26 2026-08-27 ok
staging-wp.startsteps.org 5 2026-05-25 2026-09-29 ok
careeraccelerator.startsteps.org 5 2026-04-23 2026-08-24 ok
analytics.startsteps.org 5 2026-05-24 2026-09-21 ok
pages.startsteps.org 4 2026-06-01 2026-10-03 ok
admissions.startsteps.org 5 2026-05-28 2026-09-25 ok
business.startsteps.org 5 2026-04-25 2026-08-26 ok
wordpress.startsteps.org 4 2026-06-01 2026-10-06 ok
aws.startsteps.org 5 2026-04-23 2026-08-24 ok
bit.startsteps.org 4 2026-04-11 2026-08-15 ok
axelspringer-nmt.startsteps.org 5 2026-04-23 2026-08-24 ok
chatgpt.startsteps.org 5 2026-05-03 2026-08-31 ok
next.startsteps.org 5 2026-05-25 2026-09-23 ok
servicenow.startsteps.org 5 2026-04-22 2026-08-25 ok
www.startsteps.org 5 2026-04-23 2026-08-26 ok
educate2employ.startsteps.org 5 2026-04-25 2026-08-26 ok
cybersecurity.startsteps.org 1 2026-09-14 2026-09-14 ok

Programmatic access, with DNS A records: API GET /v1/hosts/startsteps.org (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/startsteps.org.