Create a MaxMind database ISP.mmdb for BIND's named

isp-mmdb.pl

#!/usr/bin/env perl

use strict;
use warnings;
use feature qw( say );
use local::lib 'local';

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

my $filename = 'GeoIP2-ISP.mmdb'; # JPM

# 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 = (
    isp          => 'utf8_string', # JPM
);

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{Mes donnees 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,

    # permit RFC 1918 networks (JPM)
    remove_reserved_networks => 0,
);

my %address_for_employee = (	# JPM
    '192.168.1.140/32' => {
	isp	     => 'jpmens',
    },
    '192.168.33.0/24' => {
        isp          => 'Jane',
    },
    '127.0.0.0/8' => {
	isp          => 'rabbit',
    },
);

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";