Zlines are added in either a single IP, or as a range of IPs. You can zline as few or as many addresses as you want. If you do not have a good understanding of the Internet, or Zlines it would be a good idea to use an AKILL or a KLINE rather than a Zline.
/as security zline add 10.132.51.0-10.132.52.255
Be VERY carefull. zlines work across both the web server and the chat server and if you set a zline on the masks that your administrative lines are tied to you will have to shut down the server and manually edit the configuration to let you get back on the server. For those with console or control panel access the changes can be made from there.