ARP Table

From the Table menu, select ARP Table.

The Address Resolution Protocol (ARP) Table maps IP addresses to physical hardware addresses. When a host or router on your network needs to send data to another device in the network, it can use the ARP Table to find the device’s physical address.

The ARP Table is maintained dynamically by ARP, the protocol. For example, if your router receives data destined for a device with IP address, and it does not have this IP address in its ARP Table, the router broadcasts the IP address (via ARP) to machines in the local network. The IP owner replies (also via ARP) with its physical address; all other IP addresses ignore the request. When the router receives the reply, it saves the IP address and physical address pair in a cache for successive lookups – this cache is the ARP Table.

The columns in the ARP Table show the following information:

Index: A unique value that identifies the interface in the MIB’s ifTable (same as ifIndex).

Address: The IP Address of a device in the local network; for example

Physical Address: The physical hardware address associated with the IP address. For Ethernet network adapters, the physical address is assigned by the manufacturer and looks like: 006080716fc0

Type: The media type of the physical device.


See RFC 1213 and 1156 for complete descriptions of all objects.