IP Address

           An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. An IP address serves two principal functions: host or network interface identification and location addressing.

Not unique (but should be), user assigned

•  Layer 3
•  4 byte (32 bit)
•  Network part + host part
•  2564 or 4,290 million different addresses

 Normally accompanied by a subnet mask

•  IP Address : 149.218.90.19
•  Subnet Mask : 255.255.0.0

In addition to the subnet mask a default gateway is also added.

This is the device that the host should talk to if it

cannot find any particular IP address or MAC address on the connected network.

Most common name for this device is Router

There are 5 different classes

Every interface on an internet must have a unique IP address

---

Private IP address range:

• 10.0.0.0         -    10.255.255.255
• 172.16.0.0     -    172.31.255.255
• 192.168.0.0   -    192.168.255.255

It cannot be Cannot be routed over the Internet