CIDR (Classless Inter Domain Routing) Value-Part-1

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IPv4 CIDR blocks

IPv4 CIDR blocks

IPv4   CIDR

IP/CIDR

Δ   to last IP addr

Mask

Hosts   (*)

Size

Notes

a.b.c.d/32 +0.0.0.0 255.255.255.255 1 1/256 C
a.b.c.d/31 +0.0.0.1 255.255.255.254 2 1/128 C d = 0 … (2n) … 254
a.b.c.d/30 +0.0.0.3 255.255.255.252 4 1/64 C d = 0 … (4n) … 252
a.b.c.d/29 +0.0.0.7 255.255.255.248 8 1/32 C d = 0 … (8n) … 248
a.b.c.d/28 +0.0.0.15 255.255.255.240 16 1/16 C d = 0 … (16n) … 240
a.b.c.d/27 +0.0.0.31 255.255.255.224 32 ⅛ C d = 0 … (32n) … 224
a.b.c.d/26 +0.0.0.63 255.255.255.192 64 ¼ C d = 0, 64, 128, 192
a.b.c.d/25 +0.0.0.127 255.255.255.128 128 ½ C d = 0, 128
a.b.c.0/24 +0.0.0.255 255.255.255.000 256 1 C
a.b.c.0/23 +0.0.1.255 255.255.254.000 512 2 C c = 0 … (2n) … 254
a.b.c.0/22 +0.0.3.255 255.255.252.000 1,024 4 C c = 0 … (4n) … 252
a.b.c.0/21 +0.0.7.255 255.255.248.000 2,048 8 C c = 0 … (8n) … 248
a.b.c.0/20 +0.0.15.255 255.255.240.000 4,096 16 C c = 0 … (16n) … 240
a.b.c.0/19 +0.0.31.255 255.255.224.000 8,192 32 C c = 0 … (32n) … 224
a.b.c.0/18 +0.0.63.255 255.255.192.000 16,384 64 C c = 0, 64, 128, 192
a.b.c.0/17 +0.0.127.255 255.255.128.000 32,768 128 C c = 0, 128
a.b.0.0/16 +0.0.255.255 255.255.000.000 65,536 256 C = 1 B
a.b.0.0/15 +0.1.255.255 255.254.000.000 131,072 2 B b = 0 … (2n) … 254
a.b.0.0/14 +0.3.255.255 255.252.000.000 262,144 4 B b = 0 … (4n) … 252
a.b.0.0/13 +0.7.255.255 255.248.000.000 524,288 8 B b = 0 … (8n) … 248
a.b.0.0/12 +0.15.255.255 255.240.000.000 1,048,576 16 B b = 0 … (16n) … 240
a.b.0.0/11 +0.31.255.255 255.224.000.000 2,097,152 32 B b = 0 … (32n) … 224
a.b.0.0/10 +0.63.255.255 255.192.000.000 4,194,304 64 B b = 0, 64, 128, 192
a.b.0.0/9 +0.127.255.255 255.128.000.000 8,388,608 128 B b = 0, 128
a.0.0.0/8 +0.255.255.255 255.000.000.000 16,777,216 256 B = 1 A
a.0.0.0/7 +1.255.255.255 254.000.000.000 33,554,432 2 A a = 0 … (2n) … 254
a.0.0.0/6 +3.255.255.255 252.000.000.000 67,108,864 4 A a = 0 … (4n) … 252
a.0.0.0/5 +7.255.255.255 248.000.000.000 134,217,728 8 A a = 0 … (8n) … 248
a.0.0.0/4 +15.255.255.255 240.000.000.000 268,435,456 16 A a = 0 … (16n) … 240
a.0.0.0/3 +31.255.255.255 224.000.000.000 536,870,912 32 A a = 0 … (32n) … 224
a.0.0.0/2 +63.255.255.255 192.000.000.000 1,073,741,824 64 A a = 0, 64, 128, 192
a.0.0.0/1 +127.255.255.255 128.000.000.000 2,147,483,648 128 A a = 0, 128
0.0.0.0/0 +255.255.255.255 000.000.000.000 4,294,967,296 256 A

(*) For routed subnets bigger than /31 or /32, two reserved addresses need to be subtracted from the number of available host addresses: the largest address, which is used as the broadcast address, and the smallest address, which is used to identify the network itself.

This is my first post. Thanks to every body….

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