What happened to my Domain name?

I wanted to buy a Domain name CPS.net or .com as my Home page. But it's already taken. So I decided to buy Chaminda.net Last December. But b’coz of some problems I postponed that. Actually I forgot to resolve. I wanted to buy it Today. Gone mad it is not available now. I am sure it was available till January. B’coz I checked about it. So I am warning you all. If u want to buy a domain name do it ASAP. Otherwise it will no longer be available. So do it today.