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Ò»¸öIPµØÖ··ÖÎªÍøÂçµØÖ·ºÍÖ÷»úµØÖ·£¬ÍøÂçµØÖ·Çø·Ö²»Í¬ÍøÂ磬Ö÷»úµØÖ·Çø·ÖÏàÍ¬ÍøÂçÖв»Í¬Ö÷»ú¡£²»Í¬µÄIPµØÖ·ÀàËûÃǵÄÖ÷»úÍøÂçµØÖ·Ò²ÊDz»¹Ì¶¨µÄ£¬A,B,CÀàµØÖ·¶¨ÒåÁËijһÖ÷»úÌØ¶¨µÄIPµØÖ·£¬DÀàΪ×é²¥µØÖ·£¬EÀàΪ±£Áô½ñºóËùÓ᣾ßÌåµÄ»®·ÖÊÇ£º           ·ÖÀà ×îµÍ ×î¸ß ÍøÂçλ Ö÷»úλ
A 0.0.0.0 127.255.255.255 7 24
B 128.0.0.0 191.255.255.255 14 16
C 192.0.0.0 223.255.255.255 21 8
D 224.0.0.0 239.255.255.255 28 N/A
E 240.0.0.0 247.255.255.255 27 N/A       
ÍøÂçÑÚÂëµÄ×÷ÓÃÔÚÓÚ°ÑÍøÂçµØÖ·´ÓIPµØÖ·ÖÐÌáÈ¡³öÀ´£¬Êµ¼ÊÉÏ´ú±íÍøÂçÑÚÂëµÄIPºÅÓëÄ³Ò»ÌØ¶¨µÄIPµØÖ·½øÐГ°´Î»Ó딡£            ·ÖÀà ×îµÍ ×î¸ß ÍøÂçÑÚÂë
A 0.0.0.0 127.255.255.255 24
B 128.0.0.0 191.255.255.255 16
C 192.0.0.0 223.255.255.255 8
ÒÔÏÂÊǶÔIPµØÖ·½øÐмì²éºÍ·ÖÀàµÄÔ´´úÂë
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(int argc, char **argv)
{
int x;
struct sockaddr_in adr_inet;
int len_inet;
unsigned msb;
char class;
char *netmask;
static struct {
unsigned char ip[4];
} addresses[] = {
{ {
44, 135, 86, 12}}, { {
127, 0, 0, 1}}, { {
172, 16, 23, 95}}, { {
192, 168, 9, 1}},};
for (x = 0; x < 4; ++x) {
memset(&adr_inet, 0, sizeof(adr_inet));
adr_inet.sin_family = AF_INET;
adr_inet.sin_port = htons(9000);
memcpy(&adr_inet.sin_addr.s_addr, addresses[x].ip, 4);
len_inet = sizeof(adr_inet);
msb = *(unsigned char *) &adr_ine


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