diff --git a/main.py b/main.py
index 71a3166..d211a35 100644
--- a/main.py
+++ b/main.py
@@ -1,6 +1,67 @@
-def solution():
+import sys
+
+def solution(ipAddress):
     pass
+    
+    # variables declaration
+    classIP = ''
+    designationIP = ''
+    
+    ip = [0, 0, 0, 0]
+    findError = False
+    while True:
+        try:
+            if findError: ipAddress = input('please, Enter a valid IPv4 address in #.#.#.#/# format, (to exit type "x"): \n')
+            if ipAddress == 'x' or ipAddress == 'X': sys.exit()
+            
+            # Split user's input based on '/'
+            ipMask = ipAddress.split('/')
+            splitIP = ipMask[0]
+            
+            # convert data type of splitIP form str to int
+            ip = [int(i) for i in splitIP.split('.')]
+            
+            # check every single number is in the range
+            if ip[0] not in range(1, 256):
+                print('The number you entered:', ip[0], 'is out of range [1-255]')
+            elif ip[1] not in range(0, 256):
+                print('The number you entered:', ip[1], 'is out of range [0-255]')
+            elif ip[2] not in range(0, 256):
+                print('The number you entered:', ip[2], 'is out of range [0-255]')
+            elif ip[3] not in range(0, 256):
+                print('The number you entered:', ip[3], 'is out of range [0-255]')
+            
+            break
+        except ValueError as valueError:
+            findError = True
+            print('The IP address you entered Contains symbols or characters that are not allowed')
+        except IndexError as indexError:
+            findError = True
+            print('The IP address you entered does not contain the required length')
 
+    # check the ip address to which class it belongs and what his a designation
+    if ip[0] >= 1 and ip[0] <= 127:
+        classIP = 'A'
+        designationIP = 'Public'
+        if ip[0] == 127: designationIP = 'Special'
+        elif ip[0] == 10: designationIP = 'Private'
+    elif ip[0] >= 128 and ip[0] <= 191:
+        classIP = 'B'
+        designationIP = 'Public'
+        if (i[0] == 172 and i[1] >= 16 and i[1] <= 31) or ([0] == 169 and i[1] == 254): designationIP = 'Private'
+    elif ip[0] >= 192 and ip[0] <= 223:
+        classIP = 'C'
+        designationIP = 'Public'
+        if ip[0] == 192 and ip[1] == 168: designationIP = 'Private'
+    elif ip[0] >= 224 and ip[0] <= 239:
+        classIP = 'D'
+        designationIP = 'Special'
+    else :
+        classIP = 'E'
+        designationIP = 'Special'
+    
+    print('Class:', classIP, 'Designation:', designationIP)
 
 if __name__ == '__main__':
     pass
+    solution('127.0.0.1/24')
\ No newline at end of file