ip2location facebbook  ip2location twitter  ip2location google+ ip2location github

IPv4-Mapped IPv6 Address

Most internet users are aware of the 2 types of IP addresses in use today. One is Internet Protocol Version 4 (IPv4) and the other is Internet Protocol Version 6 (IPv6). The introduction of IPv6 is due to the limited addressing provided by IPv4.

Example of an IPv4 IP address: 191.239.213.197
Example of an IPv6 IP address: 2404:6800:4003:c02::64

IPv6 has a special range designed to represent an IPv4 IP address but in a form similar to IPv6. This range is known as the IPv4-mapped IPv6 address.

Let's revisit the earlier IPv4 IP address below and also show you its equivalent form in IPv4-mapped IPv6 address.

IPv4 IP address: 191.239.213.197
IPv4-mapped IPv6 address: ::ffff:191.239.213.197

All you have to do is add ::ffff: in front of your IPv4 address.

Since the IP2Location IPv6 CSV files contain IPv4-mapped IPv6 addresses, you will need to learn how to calculate the IP number in order to query IPv4 IP addresses using the IPv6 CSV files.

To calculate a normal IPv4 IP address (e.g. 191.239.213.197) to IP number, you will do the following:

(191 * 256 * 256 * 256) + (239 * 256 * 256) + (213 * 256) + 197 = 3220166085

To get the IP number for the IPv4-mapped IPv6 address, you just take the above total and add 281470681743360.

3220166085 + 281470681743360 = 281473901909445

So when you are querying an IPv4 IP address using the IPv6 CSV files, just follow the above calculations to get the IP number.


Do you like this article? Share it with others by clicking the social media buttons below. We will write more articles related to this topic.