Check if NAT-blocked

 1traceroute to splint.rs (89.216.117.22), 30 hops max, 60 byte packets
 2 1  _gateway (192.168.0.1)  0.265 ms  0.209 ms  0.193 ms
 3 2  100.64.0.1 (100.64.0.1)  56.974 ms  60.893 ms  60.911 ms
 4 3  172.31.254.2 (172.31.254.2)  61.795 ms  61.610 ms  70.443 ms
 5 4  172.31.254.2 (172.31.254.2)  69.929 ms  69.948 ms  71.265 ms
 6 5  bg-tp-m-0-be4-100.sbb.rs (89.216.12.0)  72.890 ms  73.268 ms *
 7 6  bg-ne-m-10-be3.sbb.rs (89.216.6.76)  78.474 ms  77.306 ms  77.821 ms
 8 7  * bg-tp-m-11-be1.sbb.rs (89.216.6.75)  35.022 ms bg-tp-m-12-be1.sbb.rs (89.216.6.77)  63.808 ms
 9 8  89.216.4.63 (89.216.4.63)  63.753 ms 89.216.4.61 (89.216.4.61)  65.546 ms  67.876 ms
10 9  * * *
1110  * * *
1211  * * *
1312  * * *
1413  * * *
151

1address=100.64.0.1
2curl -s http://api.db-ip.com/v2/free/$address
3    {
4        "ipAddress": "100.64.0.1",
5        "countryCode": "ZZ"
6    }