ripe.net in some European areas uses web proxies, so you could even have the same ip address listening more than once because they are sharing the same IP address with more than one customer.
Look at your OS and see who is really connected.
Windows, UNIX, Linux, MaxOS from a terminal window try the following
netstat -an | more
Something like this comes back
Proto Local Address Foreign Address State
TCP X.X.X.X Y.Y.Y.Y ESTABLISHED
X.X.X.X would be your IP address or the loopback
and Y.Y.Y.Y could be your address (service talking to itself) or and listeners.
This in Linux, UNIX, MacOS
somebox>whois Y.Y.Y.Y (enter)
This will get you the IP owners information.
If someone is abusing your network, well the whois will tell you. Windows doesnt have a Whois built in, but go to www.dnsstuff.com
left column WHOIS