Microsoft DOS arp command
Quick links
About arp
Availability
Syntax
Examples
Displays, adds and removes arp information from network devices.
The arp.exe command is an external command accessed through the C:\Windows or C:\Winnt\System32 directory and is available in the below Microsoft operating systems.
Windows 95
Windows 98
Windows ME
Windows NT
Windows 2000
Windows XP
Windows Vista
Windows 7
ARP -s inet_addr eth_adr [if_addr]
ARP -d inet_addr [if_addr]
ARP -a [inet_addr] [-N if_addr]
| -a | Displays current ARP entries by interrogating the current protocol data. If inet_addr is specified, the IP and Physical addresses for only the specified computer are displayed. If more than one network interface uses ARP, entries for each ARP table are displayed. |
| -g | Same as -a |
| inet_addr | Specifies an Internet address. |
| -N if addr | Displays the ARP entries for the network interface specified by if_addr. |
| -d | Deletes the host specified by inet_addr. |
| -s | Adds the host and associates the Internet address inet_addr with the Physical address eth_addr. The Physical address is given as 6 hexadecimal bytes seperated by hyphens. The entry is permanent. |
| eth_addr | Specifies a physical address |
| if_addr | If present, this specifies the Internet address of the interface whose address translation table should be modified. If not present, the first applicable interface will be used. |
arp -a
Interface 220.0.0.80
| Internet Address | Physical Address | Type |
| 220.0.0.160 | 00-50-04-62-F7-23 | static |
The Physical Address or MAC address as shown above in the format aa-bb-cc-dd-ee-ff is the unique manufacturer identification number. This number should always be an unique address.
An example of how to change the above IP address 220.0.0.160 to 220.0.0.161 in this case would be:
arp -s 220.0.0.161 00-50-04-62-F7-23
If an IP address has already been assigned to the specific network adapter it is not possible to change that assigned IP address to a new address. In addition, networks italicizing DHCP, BOOTP or RARP will automatically assign the card an IP address, therefore, this command would not be utilized.