Determining the country of orgin for IP address(es)

["Brian Nichols" <Brian_Nichols () dcecu org>]

Hello,
I am looking for a list or a tool that will allow us to determine and
possibly block IPs from other countries.  I am aware of Geo-IP, are
there any others?
I initially understood, please correct me if I am wrong, that when IPS
were originally given out there was a number scheme in regards to
countries. If so, is there a huge check/cross listing?

Thank you,
Brian Nichols
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