Now, first, im not an office kinda guy, infact, I can quite honestly say I avoid it like the plague, even openoffice. So that said.. I'm looking for something ( can be web based ) to help me manage my assigned IP address space. Essentially, I need to know what IP is in use for what reason. What IPs are assigned to what servers, etc. The main reason I need this is to help create a list of usage so I can request more from my provider or ARIN. They usually want a list such as:

IP.add.re.ss dns1.domain.com
IP.add.re.ss2 dns2.domain.com
...


Now, my question, does anyone know of any scripts / program or otherwise that can help simplify all this for me? Notepad just isn't cutting it for me any more.