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## `IP_FILTER_RDNS`

Option | `IP_FILTER_RDNS`
Description | IP filter for filtering which IP addresses may be queried with the `rdns()` function or `reverseDns()` function.
Introduced Version | 1.37
Default | ``

IP filter for filtering which IP addresses may be queried with the `rdns()` function or `reverseDns()` function.

The syntax of the IP address list is a sequence, separated by newlines or `;`, of `allow` or `deny` actions, along with a CIDR block or `all`. An IP address is allowed or denied by finding the first match and applying the corresponding action. The `all` value matches any IP-address (i.e., IPv4 or IPv6).

For example, here we deny RDNS queries on the CIDR block `192.168.0.0/16` and allow all others:

ini

    IP_FILTER_RDNS=deny 192.168.0.0/16; allow all

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