IN_CLASSC_HOST
return ((i)&IN_CLASSC_HOST);
addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
((IN_CLASSC(b) && (b | IN_CLASSC_HOST) == i) || \
return ((IN_CLASSC_HOST & addr) == 0 ||
(IN_CLASSC_HOST & addr) == IN_CLASSC_HOST)? 0 : 1;