Windows: ARP Command – Show Table & Clear Cache

 An ARP (Address Resolution Protocol) is a communication protocol that works on a “Physical (Data-Link)” layer of a TCP/IP stack and is used to discover a MAC address of a device on a LAN (local-area network) based on its IP address.

An ARP table is used to store the discovered pairs of the MAC and IP addresses.

In this note i will show how to display the ARP table and how to clear the ARP cache using the Windows arp command.

Windows ARP Command

Show ARP Table

To display the current ARP table in Windows, use the arp command with the -a option:

C:\> arp -a

Interface: 192.168.1.31 --- 0x7
  Internet Address    Physical Address     Type
  192.168.1.1         60-35-c0-6b-a2-b7    dynamic
  192.168.1.255       ff-ff-ff-ff-ff-ff    static
  224.0.0.22          01-00-5e-00-00-16    static
  224.0.0.252         01-00-5e-00-00-fc    static

Show the ARP table in a verbose mode:

C:\> arp -av

To record an IP and MAC address of a device on a LAN to the ARP table, simply ping it:

C:\> ping 192.168.1.95

Pinging 192.168.1.95 with 32 bytes of data:
Reply from 192.168.1.952: bytes=32 time=18ms TTL=64

C:\> arp -a

Interface: 192.168.1.31 --- 0x7
  Internet Address    Physical Address     Type
  192.168.1.1         60-35-c0-6b-a2-b7    dynamic
  192.168.1.95        d6-58-01-33-dd-bc    dynamic
  192.168.1.255       ff-ff-ff-ff-ff-ff    static
  224.0.0.22          01-00-5e-00-00-16    static
  224.0.0.252         01-00-5e-00-00-fc    static

To discover all the devices on a LAN, you can ping them all using this one-liner (adjust the IP of your network):

C:\> FOR /L %i IN (1,1,254) DO ping -n 1 -w 100 192.168.1.%i | FIND /i "Reply"

Clear ARP Cache

To clear an ARP cache it is required to open an elevated command prompt, otherwise you may receive an error as follows: “The ARP entry deletion failed: The requested operation requires elevation.”

To start the elevated command prompt, press the ⊞ Win keybutton to open the start menu, type in cmd to search for the command prompt and press the Ctrl + Shift + Enter to start the command prompt as an administrator.

To clear the ARP cache in Windows, use the arp command with the -d option:

C:\> arp -d