ARIN reserves Class A addresses for governments throughout the world and Class B addresses for companies. All other requestors are issued Class C addresses.
An example of a Class A IP address is 220.127.116.11. The first octet, 59, identifies the network number assigned by ARIN. The internal administrators of the network assign the remaining 24 bits. An easy way to recognize whether a device is part of a Class A network is to look at the first octet of its IP address, which will range from 0-126. Every network that uses a Class A IP address can have assigned up to 16,777,214 possible IP addresses to devices that are attached to its network.
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