{"id":4087,"date":"2014-01-12T15:03:55","date_gmt":"2014-01-12T20:03:55","guid":{"rendered":"http:\/\/g33kinfo.com\/info\/?p=4087"},"modified":"2014-01-12T15:03:55","modified_gmt":"2014-01-12T20:03:55","slug":"cidr-notation","status":"publish","type":"post","link":"https:\/\/g33kinfo.com\/info\/cidr-notation\/","title":{"rendered":"CIDR Notation"},"content":{"rendered":"

CIDR stands for Classless Inter-Domain Routing. CIDR was developed in the 1990s as a standard scheme for routing network traffic across the Internet.<\/p>\n


\n\/27\u00a0\u00a0\u00a0\u00a0\u00a0 1\/8th of a Class C\u00a0\u00a0\u00a0\u00a0 32 hosts
\n\/26\u00a0\u00a0\u00a0\u00a0\u00a0 1\/4th of a Class C\u00a0\u00a0\u00a0\u00a0 64 hosts
\n\/25\u00a0\u00a0\u00a0\u00a0\u00a0 1\/2 of a Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 128 hosts
\n\/24\u00a0\u00a0\u00a0\u00a0\u00a0 1 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 256 hosts
\n\/23\u00a0\u00a0\u00a0\u00a0\u00a0 2 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 512 hosts
\n\/22\u00a0\u00a0\u00a0\u00a0\u00a0 4 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1,024 hosts
\n\/21\u00a0\u00a0\u00a0\u00a0\u00a0 8 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2,048 hosts
\n\/20\u00a0\u00a0\u00a0\u00a0\u00a0 16 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 4,096 hosts
\n\/19\u00a0\u00a0\u00a0\u00a0\u00a0 32 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8,192 hosts
\n\/18\u00a0\u00a0\u00a0\u00a0\u00a0 64 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 16,384 hosts
\n\/17\u00a0\u00a0\u00a0\u00a0\u00a0 128 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 32,768 hosts
\n\/16\u00a0\u00a0\u00a0\u00a0\u00a0 256 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 65,536 hosts (= 1 Class B)
\n\/15\u00a0\u00a0\u00a0\u00a0\u00a0 512 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 131,072 hosts
\n\/14\u00a0\u00a0 \u00a0\u00a0 1,024 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 262,144 hosts
\n\/13\u00a0\u00a0\u00a0\u00a0\u00a0 2,048 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 524,288 hosts
\n<\/code>
\n 
\n 
\n
\nCIDR Notation<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
IPv4 CIDR<\/caption>\n
IP\/CIDR<\/th>\n? to last IP addr<\/th>\nMask<\/th>\nHosts (*)<\/th>\nClass<\/th>\nNotes<\/th>\n<\/tr>\n
a.b.c.d\/32<\/b><\/td>\n+0.0.0.0<\/td>\n255.255.255.255<\/td>\n1<\/td>\n1\/256 C<\/td>\n<\/td>\n<\/tr>\n
a.b.c.d\/31<\/b><\/td>\n+0.0.0.1<\/td>\n255.255.255.254<\/td>\n2<\/td>\n1\/128 C<\/td>\nd = 0 … (2n) … 254<\/td>\n<\/tr>\n
a.b.c.d\/30<\/b><\/td>\n+0.0.0.3<\/td>\n255.255.255.252<\/td>\n4<\/td>\n1\/64 C<\/td>\nd = 0 … (4n) … 252<\/td>\n<\/tr>\n
a.b.c.d\/29<\/b><\/td>\n+0.0.0.7<\/td>\n255.255.255.248<\/td>\n8<\/td>\n1\/32 C<\/td>\nd = 0 … (8n) … 248<\/td>\n<\/tr>\n
a.b.c.d\/28<\/b><\/td>\n+0.0.0.15<\/td>\n255.255.255.240<\/td>\n16<\/td>\n1\/16 C<\/td>\nd = 0 … (16n) … 240<\/td>\n<\/tr>\n
a.b.c.d\/27<\/b><\/td>\n+0.0.0.31<\/td>\n255.255.255.224<\/td>\n32<\/td>\n1\/8 C<\/td>\nd = 0 … (32n) … 224<\/td>\n<\/tr>\n
a.b.c.d\/26<\/b><\/td>\n+0.0.0.63<\/td>\n255.255.255.192<\/td>\n64<\/td>\n1\/4 C<\/td>\nd = 0, 64, 128, 192<\/td>\n<\/tr>\n
a.b.c.d\/25<\/b><\/td>\n+0.0.0.127<\/td>\n255.255.255.128<\/td>\n128<\/td>\n1\/2 C<\/td>\nd = 0, 128<\/td>\n<\/tr>\n
a.b.c.0\/24<\/b><\/td>\n+0.0.0.255<\/td>\n255.255.255.000<\/td>\n256<\/td>\n1 C<\/td>\n<\/td>\n<\/tr>\n
a.b.c.0\/23<\/b><\/td>\n+0.0.1.255<\/td>\n255.255.254.000<\/td>\n512<\/td>\n2 C<\/td>\nc = 0 … (2n) … 254<\/td>\n<\/tr>\n
a.b.c.0\/22<\/b><\/td>\n+0.0.3.255<\/td>\n255.255.252.000<\/td>\n1,024<\/td>\n4 C<\/td>\nc = 0 … (4n) … 252<\/td>\n<\/tr>\n
a.b.c.0\/21<\/b><\/td>\n+0.0.7.255<\/td>\n255.255.248.000<\/td>\n2,048<\/td>\n8 C<\/td>\nc = 0 … (8n) … 248<\/td>\n<\/tr>\n
a.b.c.0\/20<\/b><\/td>\n+0.0.15.255<\/td>\n255.255.240.000<\/td>\n4,096<\/td>\n16 C<\/td>\nc = 0 … (16n) … 240<\/td>\n<\/tr>\n
a.b.c.0\/19<\/b><\/td>\n+0.0.31.255<\/td>\n255.255.224.000<\/td>\n8,192<\/td>\n32 C<\/td>\nc = 0 … (32n) … 224<\/td>\n<\/tr>\n
a.b.c.0\/18<\/b><\/td>\n+0.0.63.255<\/td>\n255.255.192.000<\/td>\n16,384<\/td>\n64 C<\/td>\nc = 0, 64, 128, 192<\/td>\n<\/tr>\n
a.b.c.0\/17<\/b><\/td>\n+0.0.127.255<\/td>\n255.255.128.000<\/td>\n32,768<\/td>\n128 C<\/td>\nc = 0, 128<\/td>\n<\/tr>\n
a.b.0.0\/16<\/b><\/td>\n+0.0.255.255<\/td>\n255.255.000.000<\/td>\n65,536<\/td>\n256 C = 1 B<\/td>\n<\/td>\n<\/tr>\n
a.b.0.0\/15<\/b><\/td>\n+0.1.255.255<\/td>\n255.254.000.000<\/td>\n131,072<\/td>\n2 B<\/td>\nb = 0 … (2n) … 254<\/td>\n<\/tr>\n
a.b.0.0\/14<\/b><\/td>\n+0.3.255.255<\/td>\n255.252.000.000<\/td>\n262,144<\/td>\n4 B<\/td>\nb = 0 … (4n) … 252<\/td>\n<\/tr>\n
a.b.0.0\/13<\/b><\/td>\n+0.7.255.255<\/td>\n255.248.000.000<\/td>\n524,288<\/td>\n8 B<\/td>\nb = 0 … (8n) … 248<\/td>\n<\/tr>\n
a.b.0.0\/12<\/b><\/td>\n+0.15.255.255<\/td>\n255.240.000.000<\/td>\n1,048,576<\/td>\n16 B<\/td>\nb = 0 … (16n) … 240<\/td>\n<\/tr>\n
a.b.0.0\/11<\/b><\/td>\n+0.31.255.255<\/td>\n255.224.000.000<\/td>\n2,097,152<\/td>\n32 B<\/td>\nb = 0 … (32n) … 224<\/td>\n<\/tr>\n
a.b.0.0\/10<\/b><\/td>\n+0.63.255.255<\/td>\n255.192.000.000<\/td>\n4,194,304<\/td>\n64 B<\/td>\nb = 0, 64, 128, 192<\/td>\n<\/tr>\n
a.b.0.0\/9<\/b><\/td>\n+0.127.255.255<\/td>\n255.128.000.000<\/td>\n8,388,608<\/td>\n128 B<\/td>\nb = 0, 128<\/td>\n<\/tr>\n
a.0.0.0\/8<\/b><\/td>\n+0.255.255.255<\/td>\n255.000.000.000<\/td>\n16,777,216<\/td>\n256 B = 1 A<\/td>\n<\/td>\n<\/tr>\n
a.0.0.0\/7<\/b><\/td>\n+1.255.255.255<\/td>\n254.000.000.000<\/td>\n33,554,432<\/td>\n2 A<\/td>\na = 0 … (2n) … 254<\/td>\n<\/tr>\n
a.0.0.0\/6<\/b><\/td>\n+3.255.255.255<\/td>\n252.000.000.000<\/td>\n67,108,864<\/td>\n4 A<\/td>\na = 0 … (4n) … 252<\/td>\n<\/tr>\n
a.0.0.0\/5<\/b><\/td>\n+7.255.255.255<\/td>\n248.000.000.000<\/td>\n134,217,728<\/td>\n8 A<\/td>\na = 0 … (8n) … 248<\/td>\n<\/tr>\n
a.0.0.0\/4<\/b><\/td>\n+15.255.255.255<\/td>\n240.000.000.000<\/td>\n268,435,456<\/td>\n16 A<\/td>\na = 0 … (16n) … 240<\/td>\n<\/tr>\n
a.0.0.0\/3<\/b><\/td>\n+31.255.255.255<\/td>\n224.000.000.000<\/td>\n536,870,912<\/td>\n32 A<\/td>\na = 0 … (32n) … 224<\/td>\n<\/tr>\n
a.0.0.0\/2<\/b><\/td>\n+63.255.255.255<\/td>\n192.000.000.000<\/td>\n1,073,741,824<\/td>\n64 A<\/td>\na = 0, 64, 128, 192<\/td>\n<\/tr>\n
a.0.0.0\/1<\/b><\/td>\n+127.255.255.255<\/td>\n128.000.000.000<\/td>\n2,147,483,648<\/td>\n128 A<\/td>\na = 0, 128<\/td>\n<\/tr>\n
0.0.0.0\/0<\/b><\/td>\n+255.255.255.255<\/td>\n000.000.000.000<\/td>\n4,294,967,296<\/td>\n256 A<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The link below is quite useful for creating CIDR entries:
\nhttp:\/\/bonomo.info\/coyote\/cidr-calculator.php<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

CIDR stands for Classless Inter-Domain Routing. CIDR was developed in the 1990s as a standard scheme for routing network traffic across the Internet. \/27\u00a0\u00a0\u00a0\u00a0\u00a0 1\/8th of a Class C\u00a0\u00a0\u00a0\u00a0 32 hosts \/26\u00a0\u00a0\u00a0\u00a0\u00a0 1\/4th of a Class C\u00a0\u00a0\u00a0\u00a0 64 hosts \/25\u00a0\u00a0\u00a0\u00a0\u00a0 1\/2 of a Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 128 hosts \/24\u00a0\u00a0\u00a0\u00a0\u00a0 1 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 256 hosts \/23\u00a0\u00a0\u00a0\u00a0\u00a0 2… <\/p>\n

Read More<\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-4087","post","type-post","status-publish","format-standard","hentry","category-info"],"yoast_head":"\nCIDR Notation - Linux Shtuff<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/g33kinfo.com\/info\/cidr-notation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CIDR Notation - Linux Shtuff\" \/>\n<meta property=\"og:description\" content=\"CIDR stands for Classless Inter-Domain Routing. CIDR was developed in the 1990s as a standard scheme for routing network traffic across the Internet. \/27\u00a0\u00a0\u00a0\u00a0\u00a0 1\/8th of a Class C\u00a0\u00a0\u00a0\u00a0 32 hosts \/26\u00a0\u00a0\u00a0\u00a0\u00a0 1\/4th of a Class C\u00a0\u00a0\u00a0\u00a0 64 hosts \/25\u00a0\u00a0\u00a0\u00a0\u00a0 1\/2 of a Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 128 hosts \/24\u00a0\u00a0\u00a0\u00a0\u00a0 1 Class C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 256 hosts \/23\u00a0\u00a0\u00a0\u00a0\u00a0 2... 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