How to find your IP address

1. On Windows:

   $ ipconfig
   

   and:

   $ ipconfig /all
   

   
   

2. On Linux:

   $ ip addr list 
   $ ip addr list em1
   $ ip addr list eth0
   

   Output may be confusing. So do this to see what IP a remote site sees:

    wget -q -O - https://humphryscomputing.com/remote_addr.php 

   
   

3. On some other UNIX / Linux:

   $ ifconfig -a
   

4. Click a remote site (my page):
   • My IP test page
   • Page to just give REMOTE_ADDR
   • Page to just give HTTP_X_FORWARDED_FOR

5. Click a remote site (other pages):
   • whatismyip.com
   • ipaddy.com

6. VPN? (DCU IP different to remote IP)
   • If you are on the DCU VPN, your IP as seen by DCU machines will be a private IP address (10.*.*.*)
   • Other sites on the Internet will see your real (public) IP address.

7. Proxy? (remote IP different to local IP)
   • You may discover that your remotely-visible IP is different to your locally-visible (inside DCU) IP.
   • Explanation: Some machines in DCU are set up to go through a proxy.

8. whatismyip.com
   • IP info (REMOTE_ADDR)
   • check for proxy (HTTP_X_FORWARDED_FOR)