Resolve this security issue

one IP is pulling out an udp connection from my server. When I check with the whois or some lookups it was an IP theat was registered for "IANA Special Use" I wanna check which IP was that, 227.2.3.7. I wanna know whether it was an ordinary update IP for any software update. How can I figure it out..
I also wanna Know how my application is making that connection and had to prevent it if suspicious. How can I Find it out.

in task manager under processes, enable process id then run the command ARP -a to recouncile the application the IP is using , can also type it on explorer. if it is a reserved IANA IP , it cant be harmful and will not be use to breach your confidentiality