So I was on a call today trying to sell me a product that would mail to expireds and list a url something like this: 123mainstreet.expireds.com and the idea was that the person would want to see what's there.

I'm wondering if that is easy to do for each one and what might be involved? I'm envisioning that there could be a table on a site with the information that would populate the site that they are navigating to.

Had anyone ever done something like this through a wordpress or similar site?

So who would be the one establishing the url's? The individual webmaster (i.e. you) or the people who were trying to sell you that service? Exactly what does the service entail?

sure you could do this...but what would live a the subdomain?