I have all of my NNNNN.com domains parked at Parked.com. Today I log in to check my stats from yesterday and I discover that 57230.com had two clicks yesterday for $3.83 per click. I usually have a good number of clicks on my NNNNN domains, but this one made me want to do a bit more research. I started to do a little research on the domain and found out that 57230.info is registered. It appears that 57230 is a CEDEX number (postal code) for France. They also use a five digit format. 57230.info is a Proxiti site that is a network of 6,000 sites for France. It looks like to me that this is just like the Marchex .com and .net sites for US Zip codes. Just another example of the demand for number domains.