Python program to generate all possible valid ID address from given string

String is given. String contains only digit. Our task is to check all possible valid IP address combinations.

Here first we check the length of the string then split by ".". Then we check the different combination of ".".

Example

Input : "255011123222"
It's not a valid IP address.
Input : 255011345890
Valid IP address is 255.011.123.222

Algorithm

Step 1: First check the length of the string.
Step 2: Split the string by ".". We will place 3 dots in the given string. W, X, Y, and Z are numbers from 0-255 the numbers cannot be 0 prefixed unless they are 0.
Step 3: Generating different combinations.
Step 4: Check for the validity of combination.

Example Code

# Python code to check valid possible IP 
# Function checks wheather IP digits 
# are valid or not.

def ipvalid(ip): 
   # Spliting by "." 
   ip = ip.split(".") 
      
   # Checking for the corner cases 
   for i in ip: 
      if len(i) > 3 or int(i) < 0 or int(i) > 255: 
         return False
      if len(i) > 1 and int(i) == 0: 
         return False
      if len(i) > 1 and int(i) != 0 and i[0] == '0': 
         return False
   return True
  
# Function converts string to IP address 
def ipconvert(A): 
   con = len(A) 

   # Check for string size 
   if con > 12: 
      return [] 
   newip = A 
   l = [] 

   # Generating different combinations. 
   for i in range(1, con - 2): 
      for j in range(i + 1, con - 1): 
         for k in range(j + 1, con): 
            newip = newip[:k] + "." + newip[k:] 
            newip = newip[:j] + "." + newip[j:] 
            newip = newip[:i] + "." + newip[i:] 

            # Check for the validity of combination 
            if ipvalid(newip): 
               l.append(newip) 
               newip = A 
   return l  
# Driver code          
A = input("Enter IP address")
print(ipconvert(A)) 

Output

Enter IP address25525522134
['255.255.22.134', '255.255.221.34']