vim highlight ip addresses

if has("autocmd")
  highlight link ipaddress Identifier
  autocmd Syntax * syn match ipaddress /\(\(25\_[0-5]\|2\_[0-4]\_[0-9]\|1\?\_[0-9]\_[0-9]\?\)\.\)\{3\}\(25\_[0-5]\|2\_[0-4]\_[0-9]\|1\?\_[0-9]\_[0-9]\?\)\>/

  highlight link ipaddress_with_cidr Identifier
  autocmd Syntax * syn match ipaddress_with_cidr /\(\(25\_[0-5]\|2\_[0-4]\_[0-9]\|1\?\_[0-9]\_[0-9]\?\)\.\)\{3\}\(25\_[0-5]\|2\_[0-4]\_[0-9]\|1\?\_[0-9]\_[0-9]\?\)\/\(\_[1-2]\?\_[0-9]\|3\_[0-2]\)\>/
endif