Yes my dear Chinese domains. Perhaps you don't know these number domains are sold for thousands of USD and even at higher rates to end users. It becomes easy for Chinese people to memorise these domains and and understood by all thereby remaining constant.
Every number has a meaning associated with it. So accordingly Chinese choose their number domains. It is also conformed more 8's in the number domain, higher its rate is. There is a very active market for N.com, NN.com, NNN.com, NNNN.com, NNNNN.com and NNNNNN.com domains which are sold very fast on internet.
N stands for a number say 8. Therefore NNN.com means 888.com and so on and so forth. However unique combinations sell in NNNNNN.com and so far other number domains are concerned, no number available. All registered.
If you need more info you may PM me. Thanks.