diff --git a/BIGIP_decode_cookie.py b/BIGIP_decode_cookie.py
index 19b5e23..7364b7d 100644
--- a/BIGIP_decode_cookie.py
+++ b/BIGIP_decode_cookie.py
@@ -1,28 +1,47 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
-# example string: BIGip<ervername>110536896.20480.0000
+# example string: BIGipServer<servername>=110536896.20480.0000
 
 import struct
 import sys
 import re
 
 if len(sys.argv) != 2:
-    print "Usage: %s cookie" % sys.argv[0]
-    exit(1)
+    print(f"Usage: {sys.argv[0]} cookie")
+    sys.exit(1)
 
 cookie = sys.argv[1]
-print "\n[*] Cookie to decode: %s\n" % cookie
-
-(cookie_name, cookie_value) = cookie.split('=')
-
-pool = re.search('^BIGipServer([.\w\.]*)', cookie_name)
-
-(host, port, end) = cookie_value.split('.')
-
-(a, b, c, d) = [ord(i) for i in struct.pack("<I", int(host))]
-
-(e) = [ord(e) for e in struct.pack("<H", int(port))]
-port = "0x%02X%02X" % (e[0],e[1])
-
-print "[*] Pool name: %s" % (pool.group(1))
-print "[*] Decoded IP and Port: %s.%s.%s.%s:%s\n" % (a,b,c,d, int(port,16))
+print(f"\n[*] Cookie to decode: {cookie}\n")
+
+# Split cookie
+if '=' not in cookie:
+    print("[!] Invalid cookie format. Expected name=value")
+    sys.exit(1)
+
+(cookie_name, cookie_value) = cookie.split('=', 1)
+
+# Extract pool name
+pool = re.search(r'^BIGipServer([\w\.]*)', cookie_name)
+if not pool:
+    print("[!] Invalid BIGipServer cookie name")
+    sys.exit(1)
+
+# Split value
+try:
+    host, port, end = cookie_value.split('.')
+except ValueError:
+    print("[!] Invalid cookie value format. Expected host.port.end")
+    sys.exit(1)
+
+# Decode IP
+packed_ip = struct.pack("<I", int(host))
+a, b, c, d = packed_ip
+
+# Decode port
+packed_port = struct.pack("<H", int(port))
+p1, p2 = packed_port
+port_hex = "0x%02X%02X" % (p1, p2)
+decoded_port = int(port_hex, 16)
+
+print(f"[*] Pool name: {pool.group(1)}")
+print(f"[*] Decoded IP and Port: {a}.{b}.{c}.{d}:{decoded_port}\n")