# Sort the given IP addresses in ascending order

• Last Updated : 07 Mar, 2023

Given an array arr[] of IP Addresses where each element is a IPv4 Address, the task is to sort the given IP addresses in increasing order.
Examples:

Input: arr[] = {‘126.255.255.255’, ‘169.255.0.0’, ‘169.253.255.255’}
Output: ‘126.255.255.255’, ‘169.253.255.255’, ‘169.255.0.0’
Explanation:
As the second octet of the third IP Address is less than the second IP Address whereas the first octet is same. Due to which the third IP Address will be smaller than the Third IP Address.
169.255.0.0 > 169.253.255.255

Input: arr[] = {‘192.168.0.1’, ‘192.168.1.210’, ‘192.168.0.227’}
Output: ‘192.168.0.1’, ‘192.168.0.227’, ‘192.168.1.210’

Approach: The idea is to use a custom comparator to sort the given IP addresses. Since IPv4 has 4 octets, we will compare the addresses octet by octet.

• Check the first octet of the IP Address, If the first address has a greater first octet, then return True to swap the IP address, otherwise, return False.
• If the first octet of the IP Addresses is same then compare the second octet of both IP Address. If the first address has a greater second octet, then return True to swap the IP address, otherwise, return False.
• If the second octet of the IP Addresses is also the same, then compare the third octet of both IP Address. If the first address has a greater third octet, then return True to swap the IP address, otherwise, return False.
• If the third octet of the IP Addresses is also the same, then compare the fourth octet of both IP Address. If the first address has a greater third octet, then return True to swap the IP address, otherwise, return False.
• If the fourth octet is also the same, then both IP Address is equal. Then also return False.

Below is the implementation of the above approach:

## Java

 import java.util.Arrays;import java.util.Comparator; public class GFG {    // Custom Comparator to sort the Array in the increasing order    static class CustomComparator implements Comparator {        @Override        public int compare(String a, String b) {            // Breaking into the octets            String[] octetsA = a.trim().split("\\.");            String[] octetsB = b.trim().split("\\.");             // Condition if the IP Address is same then return 0            if (Arrays.equals(octetsA, octetsB)) {                return 0;            } else if (Integer.parseInt(octetsA[0]) > Integer.parseInt(octetsB[0])) {                return 1;            } else if (Integer.parseInt(octetsA[0]) < Integer.parseInt(octetsB[0])) {                return -1;            } else if (Integer.parseInt(octetsA[1]) > Integer.parseInt(octetsB[1])) {                return 1;            } else if (Integer.parseInt(octetsA[1]) < Integer.parseInt(octetsB[1])) {                return -1;            } else if (Integer.parseInt(octetsA[2]) > Integer.parseInt(octetsB[2])) {                return 1;            } else if (Integer.parseInt(octetsA[2]) < Integer.parseInt(octetsB[2])) {                return -1;            } else if (Integer.parseInt(octetsA[3]) > Integer.parseInt(octetsB[3])) {                return 1;            } else {                return -1;            }        }    }     // Function to sort the IP Addresses    public static void sortIPAddress(String[] arr) {        // Sort the Array using Custom Comparator        Arrays.sort(arr, new CustomComparator());         System.out.println(String.join(" ", arr));    }     // Driver Code    public static void main(String[] args) {        String[] arr = {"192.168.0.1", "192.168.1.210", "192.168.0.227"};         // Function Call        sortIPAddress(arr);    }} //contributed by Aditya Sharma

## Python

 # Python implementation to sort# the array of the IP Address from functools import cmp_to_key # Custom Comparator to sort the# Array in the increasing orderdef customComparator(a, b):         # Breaking into the octets    octetsA = a.strip().split(".")    octetsB = b.strip().split(".")         # Condition if the IP Address    # is same then return 0    if octetsA == octetsB:        return 0    elif octetsA[0] > octetsB[0]:        return 1    elif octetsA[0] < octetsB[0]:        return -1    elif octetsA[1] > octetsB[1]:        return 1    elif octetsA[1] < octetsB[1]:        return -1    elif octetsA[2] > octetsB[2]:        return 1    elif octetsA[2] < octetsB[2]:        return -1    elif octetsA[3] > octetsB[3]:        return 1    elif octetsA[3] < octetsB[3]:        return -1 # Function to sort the IP Addressesdef sortIPAddress(arr):         # Sort the Array using    # Custom Comparator    arr = sorted(arr, key = \       cmp_to_key(customComparator))            print(*arr)    return arr     # Driver Codeif __name__ == "__main__":    arr = ['192.168.0.1',           '192.168.1.210',           '192.168.0.227']         # Function Call    sortIPAddress(arr)

## C#

 using System;using System.Linq; public class SortIPAddress{    // Custom Comparator to sort the Array in the increasing order    public static int CustomComparator(string a, string b)    {        // Breaking into the octets        string[] octetsA = a.Trim().Split('.');        string[] octetsB = b.Trim().Split('.');         // Condition if the IP Address is same then return 0        if (Enumerable.SequenceEqual(octetsA, octetsB))        {            return 0;        }        else if (Int32.Parse(octetsA[0]) > Int32.Parse(octetsB[0]))        {            return 1;        }        else if (Int32.Parse(octetsA[0]) < Int32.Parse(octetsB[0]))        {            return -1;        }        else if (Int32.Parse(octetsA[1]) > Int32.Parse(octetsB[1]))        {            return 1;        }        else if (Int32.Parse(octetsA[1]) < Int32.Parse(octetsB[1]))        {            return -1;        }        else if (Int32.Parse(octetsA[2]) > Int32.Parse(octetsB[2]))        {            return 1;        }        else if (Int32.Parse(octetsA[2]) < Int32.Parse(octetsB[2]))        {            return -1;        }        else if (Int32.Parse(octetsA[3]) > Int32.Parse(octetsB[3]))        {            return 1;        }        else        {            return -1;        }    }     // Function to sort the IP Addresses    public static void sortIPAddress(string[] arr)    {        // Sort the Array using Custom Comparator        Array.Sort(arr, CustomComparator);         Console.WriteLine(string.Join(" ", arr));    }     // Driver Code    public static void Main(string[] args)    {        string[] arr = {"192.168.0.1", "192.168.1.210", "192.168.0.227"};         // Function Call        sortIPAddress(arr);    }} //contributed by Aditya Sharma



## C++

 // C++ code for the above approach #include #include #include #include  using namespace std; // Custom Comparator to sort the array in increasing orderbool customComparator(string a, string b) {    // Breaking into the octets    vector octetsA;    vector octetsB;     string octet = "";    for (int i = 0; i < a.size(); i++) {        if (a[i] == '.') {            octetsA.push_back(octet);            octet = "";        } else {            octet += a[i];        }    }    octetsA.push_back(octet);     octet = "";    for (int i = 0; i < b.size(); i++) {        if (b[i] == '.') {            octetsB.push_back(octet);            octet = "";        } else {            octet += b[i];        }    }    octetsB.push_back(octet);     // Condition if the IP Address is same then return false    if (octetsA == octetsB) {        return false;    }     // Compare the octets and return the result    for (int i = 0; i < 4; i++) {        if (stoi(octetsA[i]) > stoi(octetsB[i])) {            return false;        } else if (stoi(octetsA[i]) < stoi(octetsB[i])) {            return true;        }    }    return false;} // Function to sort the IP Addressesvector sortIPAddress(vector arr) {    // Sort the Array using Custom Comparator    sort(arr.begin(), arr.end(), customComparator);    return arr;} // Driver Codeint main() {    vector arr = {"192.168.0.1", "192.168.1.210", "192.168.0.227"};     // Function Call    arr = sortIPAddress(arr);     // Print the sorted array    for (int i = 0; i < arr.size(); i++) {        cout << arr[i] << " ";    }    cout << endl;     return 0;} // This code is contributed by princekumaras

Output:

192.168.0.1
192.168.0.227
192.168.1.210

Time Complexity: O(N*logN)

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