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Python program to find the type of IP Address using Regex

  • Last Updated : 02 Sep, 2021

Prerequisite: Python Regex

Given an IP address as input, write a Python program to find the type of IP address i.e. either IPv4 or IPv6. If the given is neither of them then print neither.

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What is an IP (Internet Protocol) Address?

Every computer connected to the Internet is identified by a unique four-part string, known as its Internet Protocol (IP) address. IPv4 and IPv6 are internet protocol version 4 and internet protocol version 6, IP version 6 is the new version of Internet Protocol, which is way better than IP version 4 in terms of complexity and efficiency.



  • IPv4 was the primary version brought into action for production within the ARPANET in 1983. IP version four addresses are 32-bit integers which will be expressed in hexadecimal notation.
  • IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the problem of IP v4 exhaustion. IP v6 is 128-bits address having an address space of 2128, which is way bigger than IPv4. In IPv6 we use Colon-Hexa representation. There are 8 groups and each group represents 2 Bytes.

Examples:

Input: 192.0.2.126
Output: IPv4

Input: 3001:0da8:75a3:0000:0000:8a2e:0370:7334
Output: IPv6

Input: 36.12.08.20.52
Output: Neither

Approach:

  • Take the IP address as input.
  • Now, check if this IP address resembles IPv4 type addresses using regex.
  • If yes, then print “IPv4” else check if this IP address resembles IPv6 type addresses using regex.
  • If yes, then print “IPv6”.
  • If the address doesn’t resemble any of the above types then we will print “Neither”.

Below is the implementation of the above approach:

Python3




# Python program to find the type of Ip address
 
# re module provides support
# for regular expressions
import re
 
# Make a regular expression
# for validating an Ipv4
ipv4 = '''^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.(
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.(
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.(
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)$'''
 
# Make a regular expression
# for validating an Ipv6
ipv6 = '''(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|
        ([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:)
        {1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1
        ,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}
        :){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{
        1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA
        -F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a
        -fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0
        -9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,
        4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}
        :){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9
        ])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0
        -9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]
        |1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]
        |1{0,1}[0-9]){0,1}[0-9]))'''
 
# Define a function for finding
# the type of Ip address
def find(Ip): 
   
    # pass the regular expression
    # and the string in search() method
    if re.search(ipv4, Ip):
        print("IPv4")
    elif re.search(ipv6, Ip):
        print("IPv6")
    else:
        print("Neither")
 
# Driver Code 
if __name__ == '__main__'
       
    # Enter the Ip address
    Ip = "192.0.2.126"
       
    # calling run function 
    find(Ip)
   
    Ip = "3001:0da8:75a3:0000:0000:8a2e:0370:7334"
    find(Ip)
   
    Ip = "36.12.08.20.52"
    find(Ip)

Output:

IPv4
IPv6
Neither



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