The Whois Lookup will check the availability of
.com, .net, .biz, info, .org, .co.uk, org.uk,
net.uk, plc.uk, ltd.uk, .us
domain names
After searching you may need to scroll down the page to view results

Domain Name Lookup - Please omit the "www":

.co.uk .me.uk .org.uk .net.uk .plc.uk .ltd.uk .com .net .org .biz .info