getnetbyaddr
struct netent *getnetbyaddr(uint32_t, int);
np = getnetbyaddr(net, AF_INET);
np = getnetbyaddr((long)in.s_addr,
ne = getnetbyaddr(net, AF_INET);
np = getnetbyaddr(net, AF_INET);
np = getnetbyaddr(i >> NSHIFT(mask), AF_INET);
np = getnetbyaddr(i >> NSHIFT(dmask), AF_INET);
np = getnetbyaddr(net, AF_INET);