Classful IP Address.txt

Classful Network >>

# Class A: (0 – 127) (N.H.H.H)
❖ Total addresses = 128x256x256x256 = 2,147,483,648
❖ Network bit = 1st octet (8 bit) [2^7 – 2 = 126] 
❖ Host bit = 2nd, 3rd, 4th (24 bit)
❖ Valid Host = 2^24 – 2 (Minus Network ID & Broadcast ID)
❖ Reserve hosts = 0.0.0.0 (Default route) & 127.0.0.0 (LAN card)
❖ Private IP range = 10.0.0.0 – 10.255.255.255
❖ Subnet Mask = 255.0.0.0 (default) (Network bit ON, Host bit OFF)

# Class B: (128 – 191) (N.N.H.H)
❖ Total addresses = 64x256x256x256 = 1,073,741,824
❖ Network bit = 1st, 2nd octet (16 bit) [2^14 = 16,384]
❖ Host bit = 3rd, 4th (16 bit)
❖ Valid Host = 2^16 – 2 (Minus Network ID & Broadcast ID)
❖ Reserve hosts = 169.0.0.0 (DHCP- Dynamic Host Configuration Protocol)
❖ Private IP range = 172.16.0.0 – 172.31.255.255
❖ Subnet Mask = 255.255.0.0 (default) (Network bit ON, Host bit OFF)

# Class C: (192 – 223) (N.N.N.H)
❖ Total addresses = 32x256x256x256 = 536,870,912
❖ Network bit = 1st, 2nd, 3rd octet (24 bit) [2^21 = 20,97,152]
❖ Host bit = 4th (8 bit)
❖ Valid Host = 2^8 – 2 (Minus Network ID & Broadcast ID)
❖ Reserve hosts = No reserve
❖ Private IP range = 192.168.0.0 – 192.168.255.255
❖ Subnet Mask = 255.255.255.0 (default) (Network bit ON, Host bit OFF)

# Class D: (224 – 239)
❖ Total addresses = 16x256x256x256 = 268,435,456
❖ Uses Purpose = Multicast

# Class E: (240 – 255)
❖ Total addresses = 16x256x256x256 = 268,435,456
❖ Uses Purpose = Research