models.py 文件源码

def get_available_ips(self):
        """
        Return all available IPs within this prefix as an IPSet.
        """
        prefix = netaddr.IPSet(self.prefix)
        child_ips = netaddr.IPSet([ip.address.ip for ip in self.get_child_ips()])
        available_ips = prefix - child_ips

        # Remove unusable IPs from non-pool prefixes
        if not self.is_pool:
            available_ips -= netaddr.IPSet([
                netaddr.IPAddress(self.prefix.first),
                netaddr.IPAddress(self.prefix.last),
            ])

        return available_ips