Ch6 Networks (Classes/Address Ranges/Subnet Masks/CIDR)

Class A (Public) Range & Usage

1-126; large corps

Class B (Public) Range & Usage

128-191; medium-large networks; PeachNet

Class C (Public) Range & Usage

192-223; small networks like home

Class D Range & Usage

224+; reserved for multicasting/not used

Class A (Private) IP & Subnet Mask

10.x.x.x; 255.0.0.0

Class B (Private) IP & Subnet Mask

172.16.x.x; 255.255.0.0

Class C (Private) IP & Subnet Mask

192.168.x.x; 255.255.255.0

Class D Subnet Mask

255.255.255.255; multicasting/reserved

Loopback Address & Usage

127.0.0.1; reserved for testing

APIPA Addresses for IPv4 & IPv6

169.254 for IPv4; FE80: prefix for IPv6

Reserved Private IP Ranges

10.x.x.x, 172.16.x.x, 192.168.x.x

Class C CIDR Notation: [/24]

255.255.255.0

Class C CIDR Notation: [/25]

255.255.255.128

Class C CIDR Notation: [/26]

255.255.255.192

Class C CIDR Notation: [/27]

255.255.255.224

Class C CIDR Notation: [/28]

255.255.255.240

Class C CIDR Notation: [/29]

255.255.255.248

Class C CIDR Notation: [/30]

255.255.255.252

Class C CIDR Notation: [/31]

255.255.255.254

Class A # of Hosts

16 million+ hosts

Class B # of Hosts

65 thousand+ hosts

Class C # of Hosts

254 hosts