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# Net_IPv6::getNetmask()

Net_IPv6::getNetmask() -- Calculates the network prefix

## Synopsis

    require_once 'Net/IPv6.php';

``string Net_IPv6::getNetmask` (string $ip [, int $bits = null])`

## Description

Calculates the network prefix based on the netmask bits.

## Parameter

- `string $ip` - the IP address in Hex format, compressed IPs are allowed

- `int $bits` - if the number of netmask bits is not part of the IP, you must provide the mumber of bits

## Return value

`string` - the network prefix

## Note

This function can be called statically.

Method available since: Release 1.1.0

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Net_IPv6::getAddressType() | Up | Net_IPv6::isInNetmask()