A quick and dirty cli for ipnetdb formed from the example code of mmdb ¹ and altered to lookup up prefixes or asns.

git submodule init
git submodule update
make
make install

The tool and databases will be installed under ~/.local

Multiple keys can be given on the command line

[bishop@xps13 ipnetdb]$ ipnetdb 1.1.1.1 4.2.2.1 8.8.8.8 | jq -c '[.as, .as_name, .allocation]'

[13335,"CLOUDFLARENET","1.1.1.0/24"]
[3356,"LEVEL3","4.0.0.0/9"]
[15169,"GOOGLE","8.0.0.0/9"]

[bishop@xps13 ipnetdb]$ ./ipnetdb 13335 3356 15169 | jq -c '[.as, .entity]'

[13335,"Cloudflare, Inc."]
[3356,"Level 3 Parent, LLC"]
[15169,"Google LLC"]