you are Quite Correct, This tool was the Very good tool to check SERP rankings for our keywords in each and every Data Centers.
I used this service many times for my sites and only this tool was able to check the data with accuracy and also with strong functions.
I Got the Same error , mcdar.net has been suspended.
this is the Very Sad news for all who are using this tool from long time ,Now we need to find some thing like this but I hope so if they can solve error with other domain And come back with lovely service and also Google's TOC.
i have used this tool in the past, but personally i prfer to spend time building backlinks rather than checking them, although i accept that it can be a helpful tool for managing multiple keyword campaigns