Ip Public Flashcards
Public ips
IP address are classified into 3 class’s (groups) depending on the decimal equivalent of the 1st octet in the address as below:
0-255.xxx.xxx.xxx = all address’s
Class A
Intended for a small number of networks that had a large number of computers (hosts) attached. Class A IP Address have a value in the range 1…126 as the first octet. The values 0 and 127 are not available because they have special uses. Class A addresses use the first octet to identify the network which means that 126 addresses are usable, each of which can support 16,777,216 computers (hosts).
Class B
Intended for some networks that had an intermediate number of computers (hosts) attached. Class B IP Addresses have a value in the range 128…191 as the first octet. Class B addresses use the first two octets to identify the network which means that 16,320 addresses are usable, each of which can support 65,536 computers (hosts).
Class C
Intended for a large number of networks that would have a small (relatively) number of computers (hosts) attached. Class C IP Addresses have a value in the range 192…223 as the first octet. Class C addresses use the first three octets to identify the network which means that 2,080,800 addresses (networks) are possible, each of which can support 254 computers (hosts).
