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.

14 hosts · 306 ms

HostCertsFirst seenLast seenDNS
katcon.com 4 2025-11-27 2026-10-03 ok
*.katcon.com 5 2026-08-02 2026-10-03 —
beta.katcon.com 4 2026-04-14 2026-09-01 ok
tech.katcon.com 1 2026-08-05 2026-08-05 ok
*.tech.katcon.com 1 2026-08-05 2026-08-05 —
erp-website.tech.katcon.com 2 2026-08-05 2026-08-05 ok
*.erp-website.tech.katcon.com 1 2026-08-05 2026-08-05 —
erp-access-auth.tech.katcon.com 2 2026-08-05 2026-08-05 ok
*.erp-access-auth.tech.katcon.com 1 2026-08-05 2026-08-05 —
erp-core-api.tech.katcon.com 1 2026-08-05 2026-08-05 ok
erp-api.tech.katcon.com 2 2026-08-05 2026-08-05 ok
*.erp-api.tech.katcon.com 1 2026-08-05 2026-08-05 —
digital.katcon.com 5 2026-05-02 2026-09-19 ok
www.katcon.com 1 2025-11-27 2025-11-27 ok

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