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.

13 hosts · 360 ms

HostCertsFirst seenLast seenDNS
ratehighway.com 12 2026-04-06 2026-09-06 ok
*.ratehighway.com 2 2026-04-06 2026-09-06 —
athena.ratehighway.com 2 2026-08-14 2026-08-14 ok
vibelab.ratehighway.com 2 2026-09-21 2026-09-21 ok
revenuelab.ratehighway.com 2 2026-09-28 2026-09-28 ok
rmelite.ratehighway.com 2 2026-04-11 2026-09-11 ok
api.ratehighway.com 2 2025-10-09 2026-09-08 ok
webhook.ratehighway.com 2 2025-09-21 2026-08-22 ok
internal.ratehighway.com 2 2026-08-14 2026-08-14 ok
docs.ratehighway.com 2 2025-10-11 2026-09-10 ok
utilities.ratehighway.com 2 2026-08-14 2026-08-14 ok
www.ratehighway.com 12 2026-05-15 2026-09-10 ok
arx.ratehighway.com 1 2025-08-28 2025-08-28 ok

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