OОпечатка. Правильно:
=============/tmp/Listfile.txt=============
table 1 flush
table 1 add 192.168.11.2
table 1 add 192.168.12.0/24
....
....
table 1 add 192.168.13.0/30
table 1 add 192.168.14.3
add 100 deny ip from any to table(1)
add 200 deny ip from table(1) to any
======================================

Load table:
/sbin/ipfw -q /tmp/Listfile.txt