IP Address to hex

ip_to_hex.py

#!/usr/bin/env python
import sys, re
ip_regex = re.compile('(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})')
ip_match = ip_regex.match(sys.argv[1])
if (ip_match == None):
    print 'Invalid address'
    sys.exit(1)

hex_ip_addr = 0
for i in range(1,5):
    hex_ip_addr += int(ip_match.group(i)) << (4-i)*8

print hex(hex_ip_addr).replace('0x', '').zfill(8).upper()