This task describes how to view the Address Resolution Protocol (ARP) cache, which consists of the Internet-to-Ethernet address translation tables. ARP is a TCP/IP protocol used to obtain a network node's physical address (the Machine Access Control address). The ARP cache is a list of each network device, its IP address, mask, and physical address.
The output has the following format. Following table defines each field.
Show ARP Cache Command Output Format
Device name assigned to the physical address
The numerical address or its text string alias
P - Publish, includes IP address for the computer and the addresses that have been explicitly added using the Add Host to Cache (arp -s) option
S - Static, not learned for the ARP protocol
U - Unresolved, waiting for ARP response
M - Mapping, only used for multicast entry for 188.8.131.52
The physical address, also known as the Machine Access Control (MAC) address