IsItDown allows you to check whether your website is down for just you or everybody else.
Now you can also use IsItDown to download a whois report for any domain.
This tool comes in handy if you are making DNS changes and need to check to see if everybody else can view your site. Or if you need to get in contact with a domain owner IsItDown will provide you with WhoIs data.
It will also be useful if you just want to quickly check to see if your page is up, without having to load the full website.
If your server is on the move and you want to see when it goes back online, IsItDown? will allow to check its status as many times as you want, whenever you want.
Not only are you able to check domains, you can check IP addresses and hostnames.