diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..723ef36
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
\ No newline at end of file
diff --git a/6to4_converter.py b/6to4_converter.py
old mode 100644
new mode 100755
index a7cacf6..239dd9b
--- a/6to4_converter.py
+++ b/6to4_converter.py
@@ -1,32 +1,57 @@
-ipv4Hex = ''
-ipv6Hextet1 = '2002'
-ipv6Hextet2 = ''
-ipv6Hextet3 = ''
+#!/usr/bin/env python3
 
-#take input
-print('Enter IPv4 address:')
-ipv4 = input()
+import argparse
 
-#split input to octets
-ipv4 = ipv4.split('.',4)
 
-#convert IPv4 address to hex string
-for octet in ipv4:
-	if len(hex(int(octet))[2:])>1:
-		ipv4Hex += hex(int(octet))[2:]
-	else:
-		ipv4Hex += '0'
-		ipv4Hex += hex(int(octet))[2:]
+def parse_args():
+    parser = argparse.ArgumentParser(description='Get 6to4 address from IPv4 address.')
+    parser.add_argument('-a', '--address', dest='address', action='store', help='IPv4 address', required=True)
+    args = parser.parse_args()
+    return args
 
-#split into hextets
-for i in range(4):
-	ipv6Hextet2 += (ipv4Hex[i])
-for i in range(4,8):
-	ipv6Hextet3 += (ipv4Hex[i])
 
-#Convert to dec and back to remove leading zeros
-ipv6Hextet2 = hex(int(ipv6Hextet2,16))[2:]
-ipv6Hextet3 = hex(int(ipv6Hextet3,16))[2:]
+def get_address():
+    args = parse_args()
+    return args.address
 
-#form and print 6to4 address
-print(ipv6Hextet1+':'+ipv6Hextet2+':'+ipv6Hextet3+'::/128')
\ No newline at end of file
+
+def ipv4_to_ipv6(ipv4):
+    ipv4Hex = ''
+    ipv6Hextet1 = '2002'
+    ipv6Hextet2 = ''
+    ipv6Hextet3 = ''
+
+    # Split input to octets
+    ipv4 = ipv4.split('.',4)
+
+    # Convert IPv4 address to hex string
+    for octet in ipv4:
+        if len(hex(int(octet))[2:])>1:
+            ipv4Hex += hex(int(octet))[2:]
+        else:
+            ipv4Hex += '0'
+            ipv4Hex += hex(int(octet))[2:]
+
+    # Split into hextets
+    for i in range(4):
+        ipv6Hextet2 += (ipv4Hex[i])
+    for i in range(4,8):
+        ipv6Hextet3 += (ipv4Hex[i])
+
+    # Convert to dec and back to remove leading zeros
+    ipv6Hextet2 = hex(int(ipv6Hextet2,16))[2:]
+    ipv6Hextet3 = hex(int(ipv6Hextet3,16))[2:]
+
+    # Form 6to4 address
+    output_6to4 = f"{ipv6Hextet1}:{ipv6Hextet2}:{ipv6Hextet3}::/128"
+    return output_6to4
+
+
+def main():
+    ipv4 = get_address()
+    output = ipv4_to_ipv6(ipv4)
+    print(output)
+
+
+if __name__ == '__main__':
+    main()