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.

8 hosts · 281 ms

HostCertsFirst seenLast seenDNS
uponafarm.com 4 2026-02-24 2026-07-22 ok
*.uponafarm.com 1 2026-05-04 2026-05-04 —
sagex3.azure.uponafarm.com 6 2026-06-29 2026-08-28 nxdomain
doclink.azure.uponafarm.com 4 2026-06-11 2026-10-01 nxdomain
tms.uponafarm.com 1 2025-10-10 2025-10-10 ok
www.uponafarm.com 3 2026-02-24 2026-07-22 ok
pay.uponafarm.com 2 2026-04-22 2026-10-07 ok
www.pay.uponafarm.com 2 2026-04-22 2026-10-07 nxdomain

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