Custom MaxmindDB (geoip2) with private IPs

How to create custom Maxmind database with PRIVATE IP address.

I need something like this Setting up Maxmind DB .

I have tried this Building my own MMDB database for fun and profit . So I changed the PERL script to the following:

#!/usr/bin/env perl

use strict;
use warnings;
use feature qw( say );

use MaxMind::DB::Writer::Tree;
use Net::Works::Network;

my $filename = 'users.mmdb';

# Your top level data structure will always be a map (hash).  The MMDB format
# is strongly typed.  Describe your data types here.
# See https://metacpan.org/pod/MaxMind::DB::Writer::Tree#DATA-TYPES


my %types = (
    latitude => 'uint32',
    longitude     => 'uint32',
    city         => 'utf8_string',
    country     => 'utf_string',
);

my $tree = MaxMind::DB::Writer::Tree->new(

    # "database_type" is some arbitrary string describing the database.  At
    # MaxMind we use strings like 'GeoIP2-City', 'GeoIP2-Country', etc.
    database_type => 'My-IP-Data',

    # "description" is a hashref where the keys are language names and the
    # values are descriptions of the database in that language.
    description =>
        { en => 'My database of IP data', fr => q{Mon Data d'IP}, },

    # "ip_version" can be either 4 or 6
    ip_version => 4,

    # add a callback to validate data going in to the database
    map_key_type_callback => sub { $types{ $_[0] } },

    # "record_size" is the record size in bits.  Either 24, 28 or 32.
    record_size => 24,
);

my %address_for_employee = (
    '10.1.0.0/16' => {
          latitude => -12.9608,
        longitude      => 40.5078,
        city         => 'Maputo',
    country         => 'Mozambique',
    },
    '10.2.0.0/16' => {
        latitude => -25.0519,
        longitude      => 33.6442,
        city         => 'Gaza',
    country         => 'Mozambique',
    },
);

for my $address ( keys %address_for_employee ) {

    # Create one network and insert it into our database
    my $network = Net::Works::Network->new_from_string( string => $address );

    $tree->insert_network( $network, $address_for_employee{$address} );
}

# Write the database to disk.
open my $fh, '>:raw', $filename;
$tree->write_tree( $fh );
close $fh;

say "$filename has now been created";

      

        
        
        
      

    

But no luck. Now I get the following error: Iteration is currently allowed in nodeless trees. Record type: empty on / usr / local / lib / perl / 5.14.2 / MaxMind / DB / Writer / Tree.pm line 292.

Can anyone help me create a GEOIP2 database with a private IP address?