What is ARP (Address Resolution Protocol)

Last Update: December 22, 2025 Post Views: 923

Professional, easy-to-understand blog explaining ARP with real-life examples

ARP Explained in Simple English – What It Is, Why It Is Used & How It Works

ARP (Address Resolution Protocol)


Imagine you are in a large office. You want to meet your colleague Rohan who sits on the same floor. You know his name, but you don’t know his desk number. Without his desk number, you cannot meet him.

This is exactly what happens inside a computer network.

  • Your computer knows the IP address of the destination computer.
  • But to actually deliver the packet, it needs the MAC address of destination computer

So how does your computer find the MAC address of the destination computer? 

That’s where ARP becomes a hero.


What Is ARP (Address Resolution Protocol)?

ARP (Address Resolution Protocol) is a network protocol used to  find the MAC address of a device when only the IP address is of that device is known

In Short ARP helps in getting the MAC Address 


How Does ARP Work?

Let's try to understand ARP using a example

1️⃣ Example your PC IP is 192.168.1.1 and from your PC you ping to 192.168.1.2

To communicate with 192.168.1.2

Your PC needs the  MAC Address of 192.168.1.2

Your PC will Create ARP Broadcast 

Which Means Your computer asks: “Who has IP 192.168.1.2? Tell me your MAC address.”

2️⃣ ARP Reply 

The computer that has the IP 192.168.1.2 will reply, “I am 192.168.1.2, and my MAC is AA-BB-CC-DD-EE-FF.”

This is how your PC get the MAC of 192.168.1.2 with the help of ARP and it can start further communication



FAQs 

What is ARP in simple words?

ARP helps a computer find the MAC address of a device when it only knows the IP address.

What is ARP request?

A broadcast message asking:

“Who has this IP address?”

What is ARP reply?

A response from the device that owns the IP address, containing its MAC address.

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