How Can I Convert IPv4 Addresses to and from Integers in C#?

Conversion between IPv4 address and integer in C#

C# provides efficient built-in functions for converting between standard IPv4 addresses and integers. A 32-bit unsigned integer can represent an IPv4 address.

To convert an IPv4 address to an integer, you can use the ToInt method provided in the following sample code:

public static long ToInt(string addr)
{
    // 确保正确处理符号扩展
    return (long)(uint)IPAddress.NetworkToHostOrder(
        (int)IPAddress.Parse(addr).Address);
}

Reverse conversion, that is, converting the integer back to an IPv4 address, can use the ToAddr method:

public static string ToAddr(long address)
{
    return IPAddress.Parse(address.ToString()).ToString();
}

These methods demonstrate the conversion process, including handling network/host byte swapping. The NetworkToHostOrder function is essential to ensure accurate conversion between network byte order (used when transmitting over the network) and host byte order (used on the machine).

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