$ perl test.pl country_asn.json 
Enter IPv4
Type ^D to terminate
1.1.1.1
{
    as_domain        "cloudflare.com",
    as_name          "Cloudflare, Inc.",
    asn              "AS13335",
    continent        "OC",
    continent_name   "Oceania",
    country          "AU",
    country_name     "Australia",
    end_ip           "1.1.1.255" (dualvar: 1.1),
    max              "�",
    min              "\0",
    start_ip         "1.1.1.0" (dualvar: 1.1)
}
8.8.4.4
{
    as_domain        "google.com",
    as_name          "Google LLC",
    asn              "AS15169",
    continent        "NA",
    continent_name   "North America",
    country          "US",
    country_name     "United States",
    end_ip           "8.8.4.255" (dualvar: 8.8),
    max              "\b\b�",
    min              "\b\b\0",
    start_ip         "8.8.4.0" (dualvar: 8.8)
}