Converting IPv4 addresses that have been mapped into the IPv6 address as follows;
Here's how to convert the IPv4 mapped to IPv6 address CIDR value
Example: 222.1.41.90/23 maps to ::FFFF:222.1.41.90/119
C# Code to convert CIDR from IPv4 to mapped IPv6 address
Source: http://www.tcpipguide.com/free/t_IPv6IPv4AddressEmbedding-2.htm |
Here's how to convert the IPv4 mapped to IPv6 address CIDR value
Example: 222.1.41.90/23 maps to ::FFFF:222.1.41.90/119
C# Code to convert CIDR from IPv4 to mapped IPv6 address
public static byte ConvertIPv4toIPv6CIDR(this byte CIDRIPv4) { //IPv4 CIDR - https://www.keycdn.com/support/what-is-cidr //IPv6 range for IPv4 conversion, startfrom bottom //https://www.easycalculation.com/other/cidr-blocks-table.php if (CIDRIPv4 < 1 || CIDRIPv4 > 32) return 0; // /1-32 range accepted for ipv4 int CIDRipv6 = 128 - (32 - CIDRIPv4); //lower is 96 return (byte)CIDRipv6; }
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