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# Net_IPv4::validateNetmask()

Net_IPv4::validateNetmask() -- Validate the syntax of the given netmask.

## Synopsis

    require_once 'Net/IPv4.php';

``bool validateNetmask` (string $netmask)`

## Description

Validates the syntax of a dot-quad formatted netmask. Returns true if netmask is valid, false if not.

## Note

This function can be called statically.

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Net_IPv4::validateIP() | Up | Net_IPv4::parseAddress()