IP address validation in C#

IP address validation in C#

To validate an IP address in C#, you can use regular expressions or built-in .NET methods. Regular expressions provide a flexible way to validate IP addresses, and .NET methods allow you to use built-in parsing and validation functions. Here are examples using both approaches:

Using Regular Expressions:

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string ipAddress = "192.168.1.1";

        if (IsValidIpAddress(ipAddress))
        {
            Console.WriteLine("Valid IP address.");
        }
        else
        {
            Console.WriteLine("Invalid IP address.");
        }
    }

    static bool IsValidIpAddress(string ipAddress)
    {
        // Define a regular expression pattern for IP address validation
        string pattern = @"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$";

        // Create a Regex object and check if the IP address matches the pattern
        Regex regex = new Regex(pattern);
        return regex.IsMatch(ipAddress);
    }
}

Using built-in .NET methods:

using System;
using System.Net;

class Program
{
    static void Main()
    {
        string ipAddress = "192.168.1.1";

        if (IsValidIpAddress(ipAddress))
        {
            Console.WriteLine("Valid IP address.");
        }
        else
        {
            Console.WriteLine("Invalid IP address.");
        }
    }

    static bool IsValidIpAddress(string ipAddress)
    {
        // Try to parse the IP address using IPAddress.TryParse method
        if (IPAddress.TryParse(ipAddress, out IPAddress parsedIpAddress))
        {
            // The IP address is valid
            return true;
        }

        // The IP address is not valid
        return false;
    }
}

Both approaches will validate IPv4 addresses. If you need to validate IPv6 addresses as well, you can modify the regular expression or use IPAddress.TryParse with the appropriate AddressFamily parameter to handle both IPv4 and IPv6 addresses.

Examples

  1. "IP address validation regex in C#"

    • Description: Learn how to validate IP addresses using regular expressions in C#. Understand the regex pattern and implement a method to check if a given string is a valid IP address.
    // IP address validation with regex in C#
public bool IsIpAddressValid(string ipAddress)
{
    string pattern = @"^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.([0-2]?[0-5]?[0-9]?\.){2}([0-2]?[0-5]?[0-9]?)$";
    return Regex.IsMatch(ipAddress, pattern);
}

  2. "C# IPAddress.TryParse for IP address validation"

    • Description: Explore the IPAddress.TryParse method in C# for validating IP addresses. Learn how to use this method to check if a given string represents a valid IP address.
    // Using IPAddress.TryParse for IP address validation in C#
public bool IsIpAddressValid(string ipAddress)
{
    return IPAddress.TryParse(ipAddress, out _);
}

  3. "IP address range validation in C#"

    • Description: Understand how to validate IP addresses within a specific range in C#. Implement a method that checks if an IP address falls within a specified range.
    // IP address range validation in C#
public bool IsIpAddressInRange(string ipAddress, string startRange, string endRange)
{
    IPAddress start = IPAddress.Parse(startRange);
    IPAddress end = IPAddress.Parse(endRange);
    IPAddress addressToCheck = IPAddress.Parse(ipAddress);

    return addressToCheck.IsBetween(start, end);
}

  4. "C# Validate IPv4 and IPv6 addresses"

    • Description: Learn how to validate both IPv4 and IPv6 addresses in C#. Implement a method that checks whether a given string represents a valid IPv4 or IPv6 address.
    // Validate IPv4 and IPv6 addresses in C#
public bool IsIpAddressValid(string ipAddress)
{
    return IPAddress.TryParse(ipAddress, out IPAddress parsedIpAddress) &&
           (parsedIpAddress.AddressFamily == AddressFamily.InterNetwork || 
            parsedIpAddress.AddressFamily == AddressFamily.InterNetworkV6);
}

  5. "C# Check if IP address is private or public"

    • Description: Explore how to determine if an IP address is private or public in C#. Implement a method that checks the classification of an IP address.
    // Check if IP address is private or public in C#
public bool IsIpAddressPrivate(string ipAddress)
{
    IPAddress addressToCheck = IPAddress.Parse(ipAddress);
    return addressToCheck.IsPrivate();
}

  6. "C# Validate IP address using a third-party library"

    • Description: Learn how to use a third-party library for IP address validation in C#. Implement a method that leverages the capabilities of a library for comprehensive validation.
    // Validate IP address using a third-party library in C#
public bool IsIpAddressValid(string ipAddress)
{
    return IpAddressValidator.Validate(ipAddress);
}

  7. "C# Validate IP address against CIDR notation"

    • Description: Understand how to validate IP addresses against CIDR notation in C#. Implement a method that checks whether a given IP address matches a specified CIDR range.
    // Validate IP address against CIDR notation in C#
public bool IsIpAddressInCidrRange(string ipAddress, string cidrNotation)
{
    return IPAddressRange.Parse(cidrNotation).Contains(IPAddress.Parse(ipAddress));
}

  8. "C# Check if IP address is loopback"

    • Description: Explore how to determine if an IP address is a loopback address in C#. Implement a method that checks whether a given IP address is the loopback address.
    // Check if IP address is loopback in C#
public bool IsIpAddressLoopback(string ipAddress)
{
    return IPAddress.Parse(ipAddress).IsLoopback;
}

  9. "C# Validate IP address format without parsing"

    • Description: Learn how to validate the format of an IP address without parsing it in C#. Implement a method that checks whether a given string adheres to the standard IP address format.
    // Validate IP address format without parsing in C#
public bool IsIpAddressFormatValid(string ipAddress)
{
    string[] segments = ipAddress.Split('.');
    return segments.Length == 4 && segments.All(segment => byte.TryParse(segment, out _));
}

  10. "C# Validate IP address using System.Net.NetworkInformation"

    • Description: Understand how to use the System.Net.NetworkInformation namespace for IP address validation in C#. Implement a method that leverages classes from this namespace for validation.
    // Validate IP address using System.Net.NetworkInformation in C#
public bool IsIpAddressValid(string ipAddress)
{
    return IPGlobalProperties.GetIPGlobalProperties().GetUnicastAddresses()
        .Any(addr => addr.Address.ToString() == ipAddress);
}

More Tags

nextion capslock android-xml chomp twitter-bootstrap-3 lumen text-segmentation sign angular4-httpclient android-service-binding

More C# Questions

More Math Calculators

More Stoichiometry Calculators

More Electrochemistry Calculators

More Auto Calculators