How to Find a Computer Name in a LAN from the IP Address

Computer on the Network with the Same Name

Use the nbtstat -n command to see the name of the computer in the conflict state. The IP address of the node that sent the message is in the data that this command returns. The following example shows what the data may look like in one of these events:

Offset 28 is the IP address of the computer requesting name release. To determine the decimal IP address, invert the four hexadecimal numbers and convert them to decimal numbers separated by periods. Using this method, the IP address of E7 1A 65 16 becomes 22.101.26.231.

The status column of the nbtstat output for the computer in conflict should contain either "Conflict" or "Released."

You can run the nbtstat -a command with the IP address to get the computer name.

Example: nbtstat -A 192.168.1.21

NBTSTAT -A May Return Host not Found Error Message 

To resolve this issue, verify that the NetBIOS Interface device is set to start either Automatically or Manually and that the Messenger service is set to start Automatically. Perform the following steps on the target computer:

1. Click the Start button, point to Settings, and then click Control Panel.
2. Double-click the Services icon, and select the Messenger service.
3. Click Startup, click Automatic, click OK, and then click Close.
4. Double-click the Devices icon in Control Panel, and select the NetBIOS Interface device.
5. Click Startup, click either Automatic or Manual, click OK, and click Close.
6. Restart the computer.

NOTE: Simply starting the NetBIOS Interface device is not sufficient. The NetBIOS Interface device must be reset by a NetBIOS application such as the Messenger service.
Source from here.