URL: 

Use the code below to convert the IP address of your web visitors and lookup for their geographical location, e.g. country, state, city, latitude/longitude, ZIPs, timezone and so on. Free database can be downloaded at http://lite.ip2location.com.

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1. /// <summary>
2. /// Convert IPV6 Address to IP Number
3. /// Free geolocation database can be downloaded at:
4. /// http://lite.ip2location.com/
5. /// </summary>
6.  
7. string strIP = "2404:6800:4001:805::1006";
8. System.Net.IPAddress address;
9. System.Numerics.BigInteger ipnum;
10.  
11. if (System.Net.IPAddress.TryParse(strIP, out address)) {
12. byte[] addrBytes = address.GetAddressBytes();
13.  
14. if (System.BitConverter.IsLittleEndian) {
15. System.Collections.Generic.List<byte> byteList = System.Collections.Generic.List<byte>(addrBytes);
16. byteList.

    Reverse();
17. addrBytes

    = byteList.ToArray();
18. }
19.  
20. if (addrBytes.Length > 8) {
21. //IPv6
22. ipnum

    = System.BitConverter.ToUInt64(addrBytes, 8);
23. ipnum

    <<= 64;
24. ipnum

    += System.BitConverter.ToUInt64(addrBytes, 0);
25. } else {
26. //IPv4
27. ipnum

    = System.BitConverter.ToUInt32(addrBytes, 0);
28. }
29. }