Ask HN: Has comcast / xfinity shared access to their customer database?

A family member was playing a video game and a modder in the game that could see client IP's was reading out everyone's home street address in detail if they were on Comcast. For anyone not on Comcast, they only had the state which makes sense as you can get that easily without inside ISP information. Is there a public API that Comcast provides to external entities to look up home addresses by IP? This is not in whois. Whois of course maps to their HQ in NJ. Could a Comcast employee be abusing their access? How many Comcast employees have access to that information? Does Comcast audit who pulls up this information? Have their been any recent public dumps of their customer information? I've only had my current IP for a month or so.