Convert IPv4 decimal (base 10) addresses to hex (base 16). Useful for 6to4 tunnel configs.

iptohex.py

#!/usr/bin/python
 
import sys
import re
 
def DecToHex(dec_ip):
  dec_octets = str.split(dec_ip, '.')
  hex_octets = []
 
  if len(dec_octets) != 4:
    print 'usage: ./iptohex.py x.x.x.x'
    sys.exit(1)
 
  for dec_octet in dec_octets:
    if int(dec_octet) > 255:
      print 'usage: ./iptohex.py x.x.x.x'
      sys.exit(1)
 
    if int(dec_octet) < 16:
      hex_octets.append('0' + hex(int(dec_octet))[2:])
    else:
      hex_octets.append(hex(int(dec_octet))[2:])
 
  hex_octets.insert(2, ':')
  hex_ip = ''.join(hex_octets)
  return hex_ip
 
def main():
  if (len(sys.argv) != 2):
    print 'usage: ./iptohex.py x.x.x.x'
    sys.exit(1)
 
  dec_ip = sys.argv[1]
 
  invalid = re.search(r'[^0-9\.]', dec_ip)
  if invalid:
    print 'usage: ./iptohex.py x.x.x.x'
    sys.exit(1)
 
  hex_ip = DecToHex(dec_ip)
 
  print '\nIPv4 Hex Address:\t', hex_ip
  print '6to4 Tunnel Address:\t', '2002:' + hex_ip
 
  print '\nCopyright (C) 2011 13Cubed. All rights reserved.'
 
if __name__ == '__main__':
  main()