Develop a Mac Application that ping's URL's every 5 seconds

I need an application built that will ping a list of IP's/URL's every 5 seconds and show their status. The app should be scalable, and ideally take up a maximum of 1/3 of the screen. There should be a box at the bottom to type in a new URL/IP to add to the list to be tested, and also a '-' minus button next to each entry to delete previous ones.