How Can I Tell Who's Logged in to My Network?

By Ruri Ranbe

Wired equivalent privacy (WEP), Wi-Fi Protected Access (WPA) and WPA2 refer to data encryption protocols that routers use to secure wireless networks. If your router doesn't have WEP, WPA or WPA2 enabled, or if the router is set to transmit an open WEP network, other users can log in to your wireless network without permission.If you've left your router unsecured, and you want to find out whether or not other users have logged into your network, you can check the DHCP Client Table --- a table that lists the computer devices connected to a router --- for unfamiliar IP addresses.

Step 1

Click "Start." Input "cmd" into the search box, then press "Enter," to open Command Prompt. Type "ipconfig" into the prompt, then press "Enter."

Step 2

Click "Start." Input "Notepad.exe" into the search box, then press "Enter," to open Notepad.

Step 3

Return to Command Prompt and locate the "IPv4 Address" field. Enter the series of numbers into Notepad.

Step 4

Return to Command Prompt and locate the "Default Gateway" field. Enter this second series of numbers below the first series.

Step 5

Open a browser and type the second series of numbers into the address bar. Press "Enter" to go to the router setup page.

Step 6

Enter the login information into the username and password field, or enter the default credentials if you've never accessed the router setup page. If you don't know the default login credentials, check the manual that came with the router for more information.

Step 7

Press "Enter" or click "Log In." Click the "Network" link, then click "DHCP," or click the "Status" tab, and then click "Local Network." Look for "DHCP Client Table." Some routers also display this information on the "Home" tab.

Step 8

Compare the IP addresses listed in the "DHCP Client Table" with the first series of numbers you entered in to Notepad. If there are IP addresses listed that don't match your own, the unfamiliar IPs are likely assigned to users who are connecting to your network without permission.

Tips & Warnings

  • Obtain the IP address, or IPv4 address, from each computer in your home or business before checking the DHCP Client Table.
  • Sometimes other network devices, like game consoles, will show up in the DHCP Client Table. Click "View Details" to see the type of device connected to the network.
  • The router page's interface can vary from router to router. Check the product manual for more assistance, if necessary.