Validate ip address in Grails

I am looking for a way to validate IP addresses in Grails via constraints.

Is something like this possible?

package example

class Ip {

    String ip

    static constraints = {
        ip(unique: true, inetAddress: true)
    }
}

I have found this link: http://grails.org/doc/2.2.x/api/org/codehaus/groovy/grails/validation/routines/InetAddressValidator.html, but I don't know how to implement this.

I found the solution I searched for

import org.codehaus.groovy.grails.validation.routines.InetAddressValidator

class Ip {

   String ip



 static constraints = {
    ip(blank: false, unique: true, validator: { 
         return InetAddressValidator.getInstance().isValidInet4Address(it) 
         } )
 }
}