dnsResolve()

Resolves a host name to an IP address string, or null. Performs a blocking DNS lookup.

dnsResolve(host)  →  string or null

Comparing its result with a literal (dnsResolve(host) == "10.1.2.3") breaks as soon as the record changes or resolves differently inside and outside the network. Use isInNet on a range instead, and call it at most once per evaluation.

Example

var ip = dnsResolve(host);
if (ip && isInNet(ip, "10.0.0.0", "255.0.0.0")) {
  return "DIRECT";
}

Engine notes

Availability

Related rules

• dnsResolve result compared with a literal address PAC-X010
• DNS lookup on every request PAC-P001