Hello, I have been told that my router needs to allocate private IP addresses to the public one (the one I receive from my university) in order to not disturb the funcionality of the network in the building where I am currently. Would you be able to help me understand this better: The appliances which are connected to my router have the following public IP addresses (found by: "what is my IP" on the web): 22.214.171.124 126.96.36.199 etc. The private IP addresses (got them e.g. through Terminal:isconfig) look like the following: 188.8.131.52 184.108.40.206 220.127.116.11 etc. Now are these really private addresses? My internet works fine now but I need to make sure the setting is right (otherwise I will get trouble from IT people) I have also found the following information: ranges and the amount of usable IP's are as follows: 10.0.0.0 - 10.255.255.255 Addresses: 16,777,216 172.16.0.0 - 172.31.255.255 Addresses: 1,048,576 192.168.0.0 - 192.168.255.255 Addresses: 65,536 If this is true, then my private IP addresses are not really private? And if so, what are the problems that I could cause exactly in this regard? Can I set up private address in a router manually? How? Thanks for helping me make sense of this!