/*
 arguments:
 	ip = ip address, e.g. 192.168.1.1 -> {192,168,1,1}
 	mask = address mask, e.g. 255.255.255.0 -> {255,255,255,0}
*/
ipcalc(ip, mask)=
(
	net={},
	broadcast={},
	for(i=0; i<4; ++i;
		net=PushBack(net, ip[i]& mask[i]),
		broadcast=PushBack(broadcast, ip[i]| (u8) ~mask[i])
	),
	{net, broadcast}
);