We help IT Professionals succeed at work.

Removin Unwanted IP Addresses

Medium Priority
Last Modified: 2012-05-06

I have a few IP addresses on my network that I don't know who they belong to.
If i don't know who they belong to i want them off my network.
I do not have DHCP running and all my addreses are static.
Does anyone know of a way to kick off unwanted IP addresses off the network?
And/or Find out who they are/what machine they belong to?

Thank you
Watch Question

You can find out the computer name by opening up the command prompt(Start->Run->cmd) and then type either nbtstat -a ipaddress or you can also type ping -a ipaddress.  That will resolve the host name for those computers.


Neither of those things worked out :(
I'm more focusing on how to kick people off then finding out who they are tho.
What kind of router/gateway do you have?  Is this for your home network or work?


Work Network

Depending on the type of network you are using, you should be able to turn off the switch that the ip address is connected to. Is the IP address on a wireless node or a wired node? What type of switches are you using? If you're using cisco you can go to the port interface, int fa0/1hit return and then type shutdown which will turn the port off by putting it in shutdown mode. You could also do an arp poisoning attach on the IP addresses in question by using CAIN if you use windows or arpspoof from mac or linux.

Depending on how many workstations you have, in a cmd window, just ping each ip once and do a arp -a...

Write down all the MAC addresses and go looking for em on each PC (By either looking at the Local Area Network Adaptor status or typing ipconfig /all)


That would be a possible option, but some of the devices are not known to me. Like printers, lable makers, hand held devices and the such.
Most network devices big or small will have their MAC address written down on them.... Just a matter of looking for it.

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
As kyleb84 said: Collect all IP addresses in your network. Best way is to use some kind of IP scanner.

You can use:
Advanced IP Scanner  - http://www.radmin.com/products/utilities/ipscanner.php
Angry IP Scannerhttp   - http://www.angryziber.com/w/About
or something similar.

This tool will tell you more about scanned IP then just MAC address. Maybe it helps you to find pc directly.

If not. You can use  your switch for displaying ports and MAC addresses on these ports ( if your switch is manageable ). - tell us your switch vendor and we will help you how

If your switch isnt manageable you can use information from MAC address to look after computers. Every vendor has his own hexadecimal code in MAC address ( first 6 characters).
So you collect static IPs and their MAC addresses and search for vendor on this page http://coffer.com/mac_find/. And search for PCs.  

Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.