ARP or Address Resolution Protocol in Windows is responsible for resolving IP addresses to MAC addresses to speed up connection over a local network. So instead of asking the router where a particular device is, again, it would simply use the already resolved IP to connect quickly. To get this done, it maintains a cache named ARP Cache. This post helps you understand and clear ARP Cache in Windows 11 and Windows 10.
Why do you need to Clear the ARP Cache?
Similar to DNS Cache, ARP Cache can get stale. If the IP addresses of the connected devices on the network change, it may be difficult to find those devices. So, if the ARP Cache is stale or has been damaged, you need to fix it. One of the major downsides to clearing the ARP cache is that rebuilding it may result in errors.
How to Clear ARP Cache in Windows 11/10
To clear Address Resolution Protocol (ARP) Cache on your Windows computer, you can restart the Routing and Remote Services or use the Command Prompt with netsh Tool.
Since it’s an administrative task, the methods will need admin permission or a user account to fix it.
1] Routing and Remote Services
- Press the Start button on the Keyboard and type Computer Management
- Once it appears on the list, click to open it
- Click on Services and Applications and then Services
- Locate the Routing and Remote Services and double-click to open it
- First, stop the service and then choose to disable it.
- Restart the PC, and come back to the same place, and enable it.
This process will clear all ARP or IP to MAC address mapping on the PC.
2] Command Prompt with netsh Tool
netsh tool is a command-line utility that offers a direct option to delete the ARP cache. You can run this command on PowerShell or Windows Terminal, or Command Prompt with admin privileges.
- Use WIN + X to open the Power Menu.
- Select Windows Terminal (administrator) to launch it
- Type netsh interface IP delete arpcache and press the Enter key to execute the command.
- All you will get is an Ok in response.
You can also use the following command to display and clear the ARP cache
arp –a //to display the ARP cache
arp –d //to clear ARP cache
Finally, you can also choose to restart the PC if it helps.
I hope the post was easy to follow, and you now know how to clear the ARP Cache in Windows 11 and Windows 10.
Is it possible to Clear ARP Cache for particular IP
The arp -d command can do that, i.e., arp -d 192.168.100.1. It comes in very handy if a particular IP to MAC address fails, and you want to resolve it quickly.
How long does an ARP Entry last in Windows?
The typical timeout for ARP Cache is 10 to 20 minutes, but the cache is cleared automatically. A fresh mapping is required the next time the PC or any device requests that address.
What is ARP Protocol?
Address Resolution Protocol or APR takes data from IP addresses from the computer hardware, i.e., MAC address or Machine Address. Similar to how a website name is converted into an IP address, IP addresses are further converted to Machine Addresses.
What is an Incomplete ARP Entry?
This is for individual IP addresses. When checking on the ARP entries, if you notice incomplete next to an entry, the device has issued an ARP request but is yet to receive a response.
What problems can occur with ARP?
MAC addresses spoofing and communication delays. While the first happens when ARP is manually configured, the second is when there are multiple ARP broadcasts in a network.
