Classes A–D Review
• Network hosts can be assigned a Class address of Class A–D
• These are simplt a grouping of addresses that indicate host and address
• Class A has the network number in the first byte of the address and the last
three bytes are assigned to the host.
• Class B has the network number in the first two bytes of the address and the
last two bytes are assigned to the host.
• Class C has the network number in the first three bytes of the address and
the host is assigned to the last byte.
• Class D is a multicast address.
• A is the first letter of the alphabet and therefore the network numdber is
assigned the first byte.
• B is the second letter and therefore has the network number assigned to the
first two byrtes.
• Class C is the third letter and therefore has thew network number assigned
to the first three bytes.
The classes are
Class A: 0–127
Class B: 128–191
Class C: 192–223
Class D: 223–239
Private Ip address:
10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255
In Class D: 18.104.22.168 – 22.214.171.124 is multicast.