IN_CLASSB_HOST
return ((i)&IN_CLASSB_HOST);
addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
(IN_CLASSB(b) && (b | IN_CLASSB_HOST) == i) || \
return ((IN_CLASSB_HOST & addr) == 0 ||
(IN_CLASSB_HOST & addr) == IN_CLASSB_HOST)? 0 : 1;