How to use the zat.utils.net_utils.is_special function in zat

def lookup(self, ip_address):
        """Try to do a reverse dns lookup on the given ip_address"""

        # Is this already in our cache
        if self.ip_lookup_cache.get(ip_address):
            domain = self.ip_lookup_cache.get(ip_address)

        # Is the ip_address local or special
        elif not self.lookup_internal and net_utils.is_internal(ip_address):
            domain = 'internal'
        elif net_utils.is_special(ip_address):
            domain = net_utils.is_special(ip_address)

        # Look it up at this point
        else:
            domain = self._reverse_dns_lookup(ip_address)

        # Cache it
        self.ip_lookup_cache.set(ip_address, domain)

        # Return the domain
        return domain

def lookup(self, ip_address):
        """Try to do a reverse dns lookup on the given ip_address"""

        # Is this already in our cache
        if self.ip_lookup_cache.get(ip_address):
            domain = self.ip_lookup_cache.get(ip_address)

        # Is the ip_address local or special
        elif not self.lookup_internal and net_utils.is_internal(ip_address):
            domain = 'internal'
        elif net_utils.is_special(ip_address):
            domain = net_utils.is_special(ip_address)

        # Look it up at this point
        else:
            domain = self._reverse_dns_lookup(ip_address)

        # Cache it
        self.ip_lookup_cache.set(ip_address, domain)

        # Return the domain
        return domain