ethers − Ethernet address to IP number database
/etc/ethers contains 48 bit Ethernet addresses and their corresponding IP numbers, one line for each IP number:
Ethernet−address IP−number
The two items are separated by any number of SPACE and/or TAB characters. A # at the beginning of a line starts a comment which extends to the end of the line. The Ethernet−address is written as x:x:x:x:x:x, where x is a hexadecimal number between 0 and ff which represents one byte of the address, which is in network byte order (big-endian). The IP−number may be a hostname which can be resolved by DNS or a dot separated number.
08:00:20:00:61:CA pal
/etc/ethers
arp(8), rarp(8)