二进制转换,IP地址十进制转二进制: 1 1 //10^0 2 10 //10^1 4 1 00 //10^2 8 10 00 //10^3 16 1 00 00 //10^4 32 10 00 00 //10^5 64 1 00 00 00 //10^6 128 10 00 00 00 //10^7

1 2 4 .. 128  ,共8个数

168 :  128+(32+8)     //10 10 10 00    
50 :   32+(16+2)      //00 11 00 10
192 :  128+(64)       //11 00 00 00
72 :   64+(8)         //01 00 10 00 
	
	二进制转十进制:
11111101 : 128+64+32+16+8+4+1       //251