Please Click this link for detail ----- >> Understanding CIDR Subnet Mask Notation
128 64 32 16 8 4 2 1
128 192 224 240 248 252 254 255
/1 /2 /3 /4 /5 /6 /7 /8 (/8= 255.0.0.0 /1=128.0.0.0)
/9 /10 /11 /12 /13 /14 /15 /16 (/16 = 255.255.0.0)
/17 /18 /19 /20 /21 /22 /23 /24 ( /24 =255.255.255.0 )
/25 /26 /27 /28 /29 /30 /31 /32 ( /31 =255.255.255.254 )
*** total ip for /32 = 1
*** usable ip for /32 = 1
total ip for /31 = 2
usable ip for /31 = 2-2 = 0 { total ip - 2 }
255.255.255.0 = 11111111 . 11111111 . 11111111 . 00000000 =/24 ( total no: of 1 = 24 )
255.255.255.192=11111111. 11111111 . 11111111. 11000000 = /26 (total no: of 1 = 26)
How to calculate the number of hosts on a network?
1-cmd --- >>> type ipconfig
2-255 is eight ones represented in binary
so, 8. 8 . 8 . 0 --- >>> 8 + 8 + 8 + 0 = 24 bits
3- 32 - 24 = 8 --- >>> 2 power 8 = 256
4-256 - 2 = 254
so , the final number of host = 254
2 --- >>> net address and broadcast address
