one of the criteria used in picking an NLLL domain is to look for what word or meaning the numeric and letter create. For the numeric 4 and the LLL part REX 4rex pronounce the word forex and therefore 4rex.co, this how i got my 4rex.co and NLLL.CO
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if you go to estibot and look up n480.com it will give you a value in the hundreds, i think the market for these will one day increase as 3 characters become too expensive, some of the LNNN's are products and part numbers etc
Well I did some checking with LNNN.com Letter S seems to be the most popular, I think there is just a couple of domains "S"NNN.com which are left. So just for the case I hand reg. one with no 4 in it :D