Determine IP Type - Business / Education / Residential

[qGodless]

i came across this website https://extreme-ip-lookup.com/72.19.76.50, that promises to determine if an ip address is Business / Education / Residential.
whats the logic behind it? and how can it be replicated in python, thanks

 

[Dread Pirate Roberts]

this particular website seems to use a simple WHOIS query to public databases https://en.wikipedia.org/wiki/Whois
for more precise checks you should use Maxmind service with their private data collected directly from ISPs.