# IP Authorization

As well as basic username and password authentication. The API allows ProxyUser objects to have a whitelist of IP addresses which they can authenticate from without using a username or password.

This type of authentication only works on ISP and Datacenter Proxy products.

#### Limitations

<table><thead><tr><th>Type</th><th>Default Limit</th><th>Exceed Response</th></tr></thead><tbody><tr><td>Number of IPAuthorization Per ProxyUser</td><td>3</td><td><pre><code>422
</code></pre></td></tr><tr><td>Unique IP Address for IPAuthorization across entire network</td><td>N/A</td><td><pre><code>409
</code></pre></td></tr></tbody></table>

{% hint style="info" %}
There is a Unique IP Address for IPAuthorization across entire network limitation. This means only a single ProxyUser can have a distinct IP address assigned to their IPAuthorization at any given time.
{% endhint %}


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