IP ADDRESS

•   unique addressing for each device on a network
•   usually a numerical label

WHY...?

• to identify sender and receiver
• to make link between one computer to another computer

IP VERSION

IPV4

• uses 32 bits (4 bytes) address
• address space limits (2^32)
• each ranging from 0 - 255
• separated by dots (172.16.254.1)
• 1 byte = 8 bits

IPV6

• used 128 bits (16 bytes) address
• supports more than 3,000,000,000,000,000,000,000

IP ADDRESS CLASS

A      1 - 126 (127.0.0.1 -localhost)
B      128 - 191
C      192 - 223
D      224 - 239 (multicasting) 
E      240 - 255 (quality of services) 


SUBNETMASK

• melancarkan perjalanan net

IP Subnetmask

30    = 255.255.255.252

24    = 255.255.255.0

16    = 255.255.0.0

8      = 255.0.0.0 

Kiraan subnetmask

• bila ada 255       - ip address dengan getway mesti kena sama
• bila ada 0          - tak kisah