IPV4 or Internet Protocol Version 4 is an address that provides a unique identity to the devices on the Internet and Intranet.  For Example (Non-Technical) Two people from different countries want to talk to each other with their mobile phones but if they don’t own a phone number, they can’t be able to contact each other likewise If we want to communicate on the Internet or Intranet, we need a special address (

IPV4 address is 32 bits and is divided into four equal parts/octets. Each part has 8 bits. So, each octet has a range of 0-255(2^8=256) as here we are counting from 0 that’s why we are taking it to 255.

Now IP is further divided into two parts-

  1. Public IP Address
  2. Private IP Address

Classes of IPV4

IPV4 is divided into further 5 Classes and each class has its use and property

  • Class A (0-127)
  • Class B (128-191)
  • Class C (192-223)
  • Class D (224-239)
  • Class E (240-255)

Now, one question strikes our mind: How will we know that this IP address is of which class? The Answer is by seeing their First octet/part if the number lies in between the range it belongs to that class

For Ex- by looking at this IP address the highlighted number 10 is in the first part/octet. Now we must check from the range that 10 lies in which class. The answer is Class A i.e. (0-127).

Class A

  • This Class range lies from 0-127.
  • This Class is used when we are using default routing (
  • This Class is also used for LAN Card testing ( to
  • This Class is also used in DHCP Packets.
  • The private IP range is from to locally we use a private IP address but for internet access, we need a public IP address)
  • Except that all IPs are for Public IP addresses.

Class B

  • This Class range lies from 128-191.
  • This Class is used for APIPA (Automatic Private IP Addressing) in DHCP ( to
  • The private IP range is from to
  • Except that all IP addresses are Public IP addresses.

Class C

  • This Class range lies from 192-223.
  • This Class has no reserved IP address.
  • The private IP range is from to
  • Mostly we use this class of IP address for Communication.
  • Except that all IP addresses are Public IP addresses.

Class D

  • This Class range lies from 224-239.
  • This Class is not used for assigning IP addresses to the devices.
  • This Class is specially designed for Multicasting purposes.

Class E

  • This Class range lies from 240-255.
  • This whole class is reserved for Scientific purposes and R & D.

Nowadays we are also using the enhanced version of IPV4 which is IPV6.

Zindagi Technology is an IT Consultant Company in Delhi. We have completed a lot of projects in the Public and Private sectors. Zindagi Technologies consultants have expertise in the field of designing, building, and maintaining large-scale Networks. If you require any support, Please Contact us, drop us a message at +91-9773973971, or get in touch with us via email. Follow us on LinkedIn and be in touch with the latest technology blogs.

Abhishek Kaushik
Associate Consultant


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