IP Address Classes
Class A - 1st Octet High Order Bits
0
Class A - Decimal Range
1 - 126
Class B - 1st Octet High Order Bits
10
Class C - 1st Octet High Order Bits
110
Class D - 1st Octet High Order Bits
1110
Class E - 1st Octet High Order Bits
1111
Class A - Number Of Networks
126 OR (2⁷ - 2)
Class B - Decimal Range
128 -191
Class B - Number Of Networks
16,382 OR (2¹⁴ - 2)
Class A - Hosts Per Network (Usable Addresses)
16,777,214 OR (2²⁴ - 2)
Class C - Decimal Range
192 - 223
Class C - Number Of Networks
2,097,150 OR (2²¹ - 2)
Class D - Decimal Range
224 - 239
Class E - Decimal Range
240 - 254
Class C - Hosts Per Network (Usable Addresses)
254 OR (2⁸ - 2)
Class A - Default Subnet Mask
255.0.0.0
Class B - Default Subnet Mask
255.255.0.0
Class C - Default Subnet Mask
255.255.255.0
Class B - Hosts Per Network (Usable Addresses)
65,534 OR (2¹⁶ - 2)
Class E - Default Subnet Mask
Experimental; Used for research.
Class E - Hosts Per Network (Usable Addresses)
Experimental; Used for research.
Class E - Network/Host ID
Experimental; Used for research.
Class E - Number Of Networks
Experimental; Used for research.
Class A - Network/Host ID
N.H.H.H
Class B - Network/Host ID
N.N.H.H
Class C - Network/Host ID
N.N.N.H
Class D - Default Subnet Mask
Reserved for Multicasting. Multicast IP Routing protocols are used to distribute data (for example, audio/video streaming broadcasts) to multiple recipients.
Class D - Hosts Per Network (Usable Addresses)
Reserved for Multicasting. Multicast IP Routing protocols are used to distribute data (for example, audio/video streaming broadcasts) to multiple recipients.
Class D - Network/Host ID
Reserved for Multicasting. Multicast IP Routing protocols are used to distribute data (for example, audio/video streaming broadcasts) to multiple recipients.
Class D - Number Of Networks
Reserved for Multicasting. Multicast IP Routing protocols are used to distribute data (for example, audio/video streaming broadcasts) to multiple recipients.