Shell Programming and Scripting

I cannot figure out what is wrong.... I have 3 files with IP addresses:
file1 134.123.3.236
file2 134.123.3.235
file3 134.123.5.237
I type "prob1 Oops x2x3x4". Then my code creates file with name Oops and first line x2x3x4. Moreover, my code generate IP and it gives to file Oops as a second line. In addition, my code looks at all files with IP addresses compare and give next own IP. For example, the maximum according to third and fourth oct is file3 with his IP! So I need to create Oops file with 134.123.5.238 (254 is a max ) as a second line.

Everything works but my second line gives me wrong IP. Help me please ;( thanks

Code:

for i in $1 $2
   do

my_variable=$(awk -F '[.]' '
$3 > m3 {m3 = $3; m4 = $4; next}
$3 == m3 && $4 > m4 {m4 = $4; m4=$4 + 1 }
END { if(m4 == 254) {m4=0; m3++}

{print  "134.123."m3"."m4
}

} ' /Users/Unknown/hosts/*
)

echo "$2" "\n" "$my_variable" > /Users/Unknown/hosts/$1.txt

done