Clear the ARP cache in Windows 11/10

See in this article how to clean it cache (temporary) memory ARP in Windows 10 and Windows 11.

ARP, cache, memory, Windows 10, Windows 11

what is the ARP cache;
The ARP (Address Resolution Protocol) or in Greek Address Resolution Protocol in Windows is responsible for resolving IP addresses in MAC addresses, in order to speed up the connection through the local network. So instead of asking the router over and over where a particular device is, it simply uses the already resolved IP for a quick connection. To do this, maintain a temporary memory called ARP cache.

Like all things in the technical world, it sometimes gets stuck or breaks down and needs to be restored. This post will help you understand what it is and how to clear the cache ARP in Windows 11 and Windows 10.

Why you need to clear the cache ARP;
There are usually four types of cache in Windows 10/ 11 that you can easily clean:
1. Cache memory
2. DNS memory
3. Thumbnail cache
4. Memory ARP

Similar to DNS cache, the cache ARP can also be cleaned. If the IP address of the devices connected to the network changes, then it may be difficult to find these devices. So if the ARP cache has old data or is damaged, then you need to fix it. One of the major drawbacks of clearing cache ARP is that the process of rebuilding the cache ARP can lead to errors.

How to clear the cache ARP in Windows 11/ 10
You can use these methods to resolve a cache problem ARP.
A. Routing and remote access services
B. Command line with the netsh tool

Since this is a management task, the methods will need administrator permission to operate.

A. Routing and remote access services
routing remote service

A.1 Press the Start button and type Computer Management
A.2 Once it appears in the list, click on it to open it
A.3 In the left pane, click Services and Applications, then Services
A.4 In the right pane, locate "Routing and Remote Services" and double-click to open it.
A.5 First, terminate the service, then select to turn it off.
A.6 Restart the computer and return to the same place and turn it on.

This process will clear all the matches ARP or IP to MAC addresses on the computer.

B. Command line with the netsh tool
arp cache netsh

The netsh tool is a command line utility that offers an immediate option to clear the cache ARP. You can run this command in PowerShell or in Windows Terminal or in the command prompt with administrator privileges.

B.1 Press the Win + X keys simultaneously
B.2 From the menu that appears select Command Prompt (administrator) to start it
B.3 In the command prompt window type netsh IP interface delete arpcache and press the Enter key to execute the command.
B.4 All you will receive is an Ok in response.
You can also use the following command to display and clear the cache ARP

arp –a // για εμφάνιση του ARP cache
arp –d // για εκκαθάριση της προσωρινής μνήμης ARP

Finally, you can also choose to restart the computer.

Cache can be cleared ARP for a specific IP?
The order arp -d can do this, that is, if you give the command arp -d will clear the corresponding IR. This is very convenient if a specific IP address fails on the MAC and you want to resolve it quickly.

How long does an entry take? ARP in Windows?
The standard time limit for ARP cache is 10 to 20 minutes. After this time the cache is automatically deleted. The next time the computer or any device requests this address, a new assignment is required.

What is a protocol? ARP;
The Address Resolution Protocol or APR receives data from IP addresses from the computer hardware, i.e., MAC address or machine address. Similar to how a site name is converted to an IP address, IP addresses are further converted to Machine Addresses.

What is the incomplete entry ARP;
This applies to individual IP addresses. When checking entries ARP, if you notice missing items next to an entry, the device has issued a request ARP but has not yet received a response.

What problems can arise with ARP;
The MAC address deals with spoofing and communication delays. While the first occurs when it is set manually ARP, the second is when there are many shows ARP on a network.

We understand that today's article was a bit difficult for the average user, but hopefully you now know how to clear the cache ARP in Windows 11 and 10.

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