I just thought it would be a funny thing to do. I don't even live in NY - so it wouldn't cause me issue. My home router used to use the same MAC address as the wifi router of McDonalds in Times Square. Most NIC cards today are programmable, so either the problem was caused by bad luck - or a user programmed it. MAC addresses usually are written in the six groups of two hexadecimal digits separated by colons (:) or hyphens. (OUI) and usually encodes the manufacturer. Just enter MAC address and get its vendor name or give vendor title and determine his MAC adresses list. So, 50 people could all have a reddit license plate and wouldn't cause issue - with the exception of getting the plate called into the police and the caller didn't know what state it was from. MAC address lookup: vendor, ethernet, bluetooth MAC Addresses Lookup and Search. Similarly you can have the same license plate as someone in another state. Useful when you are looking for a specific brand device and have a lot of ports to review. Requires Python 3.x, json library, hashlib library. The script uses Michael Huangs manuf python library at Parser library for Wiresharks OUI database. So it doesn't matter if you have the same MAC on your home computer as a 1000 people - only if you tried to network them on the same subnet. Convert the output from 'show mac add int g1/0/1 i Gi' to the manufacturer name. So an organization could have issues with reporting of multiple machines had the same MAC, all networking would still function without issue (as long as they were on separate subnets. While you could have other software in an organization that requires MAC addresses for inventory, this doesn't interfere with networking. MAC addresses only have to be unique within a subnet. Having run into the issue of duplicate mac addresses (once in about 20 years) - they can't and don't necessarily have to keep them all unique.
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