From: Subject: CIDR Conversion Table Date: Wed, 15 Oct 2003 14:15:05 +0200 MIME-Version: 1.0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.belchfire.net/webtools/cidr_converstion_table.html X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 CIDR Conversion Table

CIDR Conversion Table provided by Belchfire.net - xp|net themes = community

CIDR = Conversion=20 Table

CIDR prefix = length

Dotted = Decimal=20 Netmask

Hexidecimal=20 Netmask

Inverse=20 Netmask

Binary

Number of = Classfull=20 Networks

Number of = Usable=20 IPs
/1 128.0.0.0 80 00 00 00 127.255.255.255 1000 0000 = 0000 0000=20 0000 0000 0000 0000 128 = As 2,147,483,646
/2 192.0.0.0 C0 00 00 00 63.255.255.255 1100 0000=20 0000 0000 0000 0000 0000 0000 64 = As 1,073,741,822
/3 224.0.0.0 E0 00 00 00 31.255.255.255 1110 0000 = 0000 0000=20 0000 0000 0000 0000 32 = As 536,870,910
/4 240.0.0.0 F0 00 00 00 15.255.255.255 1111 0000 = 0000 0000=20 0000 0000 0000 0000 16 = As 268,435,454
/5 248.0.0.0 F8 00 00 00 7.255.255.255 1111 1000 = 0000 0000=20 0000 0000 0000 0000 8 = As 134,217,726
/6 252.0.0.0 FC 00 00 00 3.255.255.255 1111 1100 = 0000 0000=20 0000 0000 0000 0000 4 = As 67,108,862
/7 254.0.0.0 FE 00 00 00 1.255.255.255 1111 1110 = 0000 0000=20 0000 0000 0000 0000 2 = As 33,554,430
/8 255.0.0.0 FF 00 00 00 0.255.255.255 1111 1111 = 0000 0000=20 0000 0000 0000 0000 1 A or = 256=20 Bs 16,777,214
/9 255.128.0.0 FF 80 00 00 0.127.255.255 1111 1111 = 1000 0000=20 0000 0000 0000 0000 128 = Bs 8,388,606
/10 255.192.0.0 FF C0 00 00 0.63.255.255 1111 1111 = 1100 0000=20 0000 0000 0000 0000 64 = Bs 4,194,302
/11 255.224.0.0 FF E0 00 00 0.31.255.255 1111 1111 = 1110 0000=20 0000 0000 0000 0000 32 = Bs 2,097,150
/12 255.240.0.0 FF F0 00 00 0.15.255.255 1111 1111 = 1111 0000=20 0000 0000 0000 0000 16 = Bs 1,048,574
/13 255.248.0.0 FF F8 00 00 0.7.255.255 1111 1111 = 1111 1000=20 0000 0000 0000 0000 8 = Bs 524,286
/14 255.252.0.0 FF FC 00 00 0.3.255.255 1111 1111 = 1111 1100=20 0000 0000 0000 0000 4 = Bs 262,142
/15 255.254.0.0 FF FE 00 00 0.1.255.255 1111 1111 = 1111 1110=20 0000 0000 0000 0000 2 = Bs 131,070
/16 255.255.0.0 FF FF 00 00 0.0.255.255 1111 1111 = 1111 1111=20 0000 0000 0000 0000 1 B or = 256=20 Cs 65,534
/17 255.255.128.0 FF FF 80 00 0.0.127.255 1111 1111 = 1111 1111=20 1000 0000 0000 0000 128 = Cs 32,766
/18 255.255.192.0 FF FF C0 00 0.0.63.255 1111 1111 = 1111 1111=20 1100 0000 0000 0000 64 = Cs 16,382
/19 255.255.224.0 FF FF E0 00 0.0.31.255 1111 1111 = 1111 1111=20 1110 0000 0000 0000 32 = Cs 8,190
/20 255.255.240.0 FF FF F0 00 0.0.15.255 1111 1111 = 1111 1111=20 1111 0000 0000 0000 16 = Cs 4,094
/21 255.255.248.0 FF FF F8 00 0.0.7.255 1111 1111 = 1111 1111=20 1111 1000 0000 0000 8 = Cs 2,046
/22 255.255.252.0 FF FF FC 00 0.0.3.255 1111 1111 = 1111 1111=20 1111 1100 0000 0000 4 = Cs 1,022
/23 255.255.254.0 FF FF FE 00 0.0.1.255 1111 1111 = 1111 1111=20 1111 1110 0000 0000 2 = Cs 510
/24 255.255.255.0 FF FF FF 00 0.0.0.255 1111 1111 = 1111 1111=20 1111 1111 0000 0000 1 = C 254
/25 255.255.255.128 FF FF FF 80 0.0.0.127 1111 1111 = 1111 1111=20 1111 1111 1000 0000 1/2 = C 126
/26 255.255.255.192 FF FF FF C0 0.0.0.63 1111 1111 = 1111 1111=20 1111 1111 1100 0000 1/4 = C 62
/27 255.255.255.224 FF FF FF E0 0.0.0.31 1111 1111 = 1111 1111=20 1111 1111 1110 0000 1/8 = C 30
/28 255.255.255.240 FF FF FF F0 0.0.0.15 1111 1111 = 1111 1111=20 1111 1111 1111 0000 1/16 = C 14
/29 255.255.255.248 FF FF FF F8 0.0.0.7 1111 1111 = 1111 1111=20 1111 1111 1111 1000 1/32 = C 6
/30 255.255.255.252 FF FF FF FC 0.0.0.3 1111 1111 = 1111 1111=20 1111 1111 1111 1100 1/64 = C 2
/31 255.255.255.254 FF FF FF FE 0.0.0.1 1111 1111 = 1111 1111=20 1111 1111 1111 1110 1/128 = C 0
/32 255.255.255.255 FF FF FF FF 0.0.0.0 1111 1111 = 1111 1111=20 1111 1111 1111 1111 1/256 = C 1
  =
Reserved Network = Numbers
Class Start End Number of = IPs Comment
  A   10.0.0.0   10.255.255.255   16,777,216   A single Class A network = number
  B   172.16.0.0   172.31.255.255 1,048,544   16 contiguous Class B network=20 numbers
  C   192.168.0.0     192.168.255.255   65,534   256 contiguous Class C network=20 = numbers