Written by Elliot Keavney (Website)
Subnetcalc Source Code (GitHub)
IETF RFC 1918 Document




    10.0.0.0/8    

    (10.0.0.0 to 10.255.255.255)    


    192.168.0.0/16    

    (192.168.0.0 to 192.168.255.255)    













1st Octet 2nd Octet 3rd Octet 4th Octet
256^3 = 16777216 256^2 = 65536 256^1 = 256 256^0 = 1
/0 (4294967296)
/1 (2147483648)
/2 (1073741824)
/3 (536870912)
/4 (268435456)
/5 (134217728)
/6 (67108864)
/7 (33554432)

/8 (16777216)
/9 (8388608)
/10 (4194304)
/11 (2097152)
/12 (1048576)
/13 (524288)
/14 (262144)
/15 (131072)

/16 (65536)
/17 (32768)
/18 (16384)
/19 (8192)
/20 (4096)
/21 (2048)
/22 (1024)
/23 (512)

/24 (256)
/25 (128)
/26 (64)
/27 (32)
/28 (16)
/29 (8)
/30 (4)
/31 (2)
/32 (1)