tFastDNS

tFastDNS is a compact and portable piece of software that gives users the possibility of quickly changing their DNS address. It can be effortlessly used by all types of individuals, regardless of their skill level.
Since installation is not a prerequisite, you can just drop the executable file anywhere on the hard drive and run it immediately.
Otherwise, tFastDNS can be saved to a removable storage unit (like a USB flash drive), from where you can access its functions on any workstation with minimum effort.
One of the most important aspects about portable apps is that they do not work with the Registry section of Windows, or leave files behind on the hard drive after removing it.
The GUI of the utility consists of a single window with a plain and simple layout. The WYSIWYG concept certainly applies to the tool, as there are no other options available, aside from the ones visible in the primary frame.
All you have to do is select a network adapter and DNS service (e.g. Google DNS, Open DNS, ScrubIT, Comodo DNS), as well as write the preferred and alternate DNS servers, in order to immediately apply the new settings to the system.
In addition, you can enable the use of custom DNS servers, restore all settings to their factory values, as well as flush the DNS. There are no other options or configurable settings available through this tool.
tFastDNS is very light on the system resources, using a small quantity of CPU and system memory. It has a good response time and rapidly applies the DNS modifications to the computer, without errors, hanging or crashing. We have not experienced any issues in our tests. Thanks to its intuitive layout and overall simplicity, first-time users can quickly get accustomed to tFastDNS.