IP.php

<?php

namespace Acme\DemoBundle\Entity;

class IP
{
    /** 
     * @var integer $id
     */
    private $id;

    /** 
     * @var integer $ip
     */
    private $ip;

    /** 
     * @var string $high
     */
    private $high;

    /** 
     * @var string $hoster
     */
    private $hoster;

    /**
     * @var date $scandate
     */
    private $scandate;

...

IPExampleTest.php

<?php

namespace Acme\DemoBundle\Tests;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Acme\DemoBundle\Entity\IP;
use Acme\DemoBundle\Form\IPExampleType;

class IPExampleTest extends WebTestCase
{
    /** 
     * @test
     */
    public function shouldConvertValueOfIpToInt()
    {   
        $kernel = static::createKernel();
        $kernel->boot();

        $ip = new IP();

        $form = $kernel->getContainer()->get('form.factory')->create(new IPExampleType(), $ip);
        $form->bind(array('ip' => '80.0.0.1'));

        $this->assertSame(1342177281, $form->getData()->getIp());
    }   

    /** 
     * @test
     */
    public function shouldShowIpInNormalFormat()
    {   
        $kernel = static::createKernel();
        $kernel->boot();

        $ip = new IP();
        $ip->setIp(1342177281);

        $form = $kernel->getContainer()->get('form.factory')->create(new IPExampleType(), $ip);

        $this->assertSame('80.0.0.1', $form->createView()->getChild('ip')->get('value'));
    }   
}

IPExampleType.php

<?php

namespace Acme\DemoBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class IPExampleType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {   
        $builder
            ->add('ip', 'ip')
            ->add('high')
            ->add('hoster')
            ->add('scandate')
        ;   
    }   

    public function getName()
    {   
        return 'ip_example';
    }   
}

IpTransformer.php

<?php

namespace Acme\DemoBundle\Form;

use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;

class IpTransformer implements DataTransformerInterface
{
    public function transform($ip)
    {   
        return long2ip($ip);
    }   

    public function reverseTransform($ip)
    {   
        return ip2long($ip);
    }   
}

IPType.php

<?php

namespace Acme\DemoBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;

class IPType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {   
        $ipTransformer = new IPTransformer();

        $builder->appendClientTransformer($ipTransformer)
        ;   
    }   

    public function getName()
    {   
        return 'ip';
    }   

    public function getParent(array $options)
    {   
        return 'text';
    }   
}

services.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="acme_ip.type" class="Acme\DemoBundle\Form\IPType">
            <tag name="form.type" alias="ip" />
        </service>
    </services>
</container>