Herouxapps

NetSetMan allows you to quickly switch between pre-configured network settings. The program is ideal for people on the road, who frequently connect to different networks and need to update or reconfigure their network settings each time. NetSetMan eliminates the need for manual configurations, you can simply create different profiles to store your network configuration, and then switch between them with the click of a button. NetSetMan can apply configuration settings for IP address Subnet Mask, Default Gateway, WiFi, Printer, DNS servers and more. The free version is limited to 6 network profiles, which is more than enough for personal usage

You can change by a click of a button, the internet profile. ( for example at home I have 2 different wi-fi networks on different subnet, this is a pain to manually change the data all the time. This utility is great to quickly switch profile. You can specify dns, subnet, ip etc..  The only problem I encountered with it is that I had to select my profile twice , it would not connect the first time.