ParseRange & TryParseRange

ParseRange and TryParseRange

A C# utility for converting IP address ranges into optimal CIDR blocks, supporting both IPv4 and IPv6 addresses.
Both IPv4 and IPv6 ranges are supported
The algorithm generates the minimal set of CIDR blocks that exactly cover the specified range
Input format must be "startIP - endIP" with a single hyphen separator
Whitespace around IP addresses is automatically trimmed
Mixed IPv4/IPv6 ranges are not supported (both addresses must be the same family)

IPv4 Example

string ipv4Range = "192.168.1.45 - 192.168.1.65";
var ipv4Blocks = IPNetwork2.ParseRange(ipv4Range);

Console.WriteLine($"CIDR blocks for {ipv4Range}:");
foreach (var block in ipv4Blocks)
{
Console.WriteLine($"  {block}");
}

Output

CIDR blocks for 192.168.1.45 - 192.168.1.65:
  192.168.1.45/32
  192.168.1.46/31
  192.168.1.48/28
  192.168.1.64/31

IPv6 Example

string ipv6Range = "2001:db8::1000 - 2001:db8::1fff";
var ipv6Blocks = IPNetwork2.ParseRange(ipv6Range);

Console.WriteLine($"CIDR blocks for {ipv6Range}:");
foreach (var block in ipv6Blocks)
{
Console.WriteLine($"  {block}");
}

Ouput

CIDR blocks for 2001:db8::1000 - 2001:db8::1fff:
  2001:db8::1000/116