i want to ban IP in C Class in this Script please help me to modify the script

like i want ban on ip like *!*@203.99.55.* instead of *!*@203.99.55.66

Script is

if (hot isin $nick) || (stud isin $nick) {
if (hotmail isin $nick) || (hotnews isin $nick) || (hotcake isin $nick) || (hota isin $nick) || (student isin $nick) || (study isin $nick) return
else kick # $nick 4[bad nick | ban -u300 # $nick
}

waiting for feed back please