During my analysis of Apple AirPlay connections to my Yamaha Network Receiver I was also interested in which TCP/UDP ports are opened on this audio device at all. Hence I did a basic port scan with Nmap for both transport layer protocols. (In an upcoming blogpost I am analyzing a packet capture from the Yamaha receiver which will show more details about the used ports and outgoing connections.) At first here are the Nmap results:
Several years ago I built a little script to show my IP address, just as many other sites implement it. The difference to my script is that it doesn’t display any kind of commercial or other annoying stuff. Just the IP address and a few other information. The script is accessible under http://ip.webernetz.net.