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.

7 hosts · 282 ms

HostCertsFirst seenLast seenDNS
argorand.io 3 2026-06-20 2026-08-26 ok
api.argorand.io 1 2025-11-25 2025-11-25 ok
analytics.argorand.io 5 2026-04-29 2026-08-19 ok
pass.argorand.io 5 2026-05-05 2026-09-03 ok
asapcv.argorand.io 4 2025-07-17 2026-07-03 ok
2a57j7824by9exnuqgh4jzqx356ziwi.asapcv.argorand.io 3 2025-07-17 2026-06-17 nxdomain
www.argorand.io 3 2026-06-20 2026-08-26 ok

Programmatic access, with DNS A records: API GET /v1/hosts/argorand.io (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/argorand.io.