diff --git a/roles/ipcheck/files/ipcheck.sh b/roles/ipcheck/files/ipcheck.sh
index 44df494..f8ced55 100755
--- a/roles/ipcheck/files/ipcheck.sh
+++ b/roles/ipcheck/files/ipcheck.sh
@@ -7,7 +7,7 @@ echo "마지막 수행 시간 : $(date +%Y-%m-%d-%r)<br><br>" > README.md
 echo "|IP Address&emsp;&emsp;&emsp;&emsp;&emsp;|Check Result&emsp;&emsp;&emsp;&emsp;&emsp;|" >> README.md
 echo "|:---|:---|" >> README.md
 
-for ((i=${start_ip##*.}; i<=${end_ip##*.}; i++)); do
+for i in $(seq ${start_ip##*.} ${end_ip##*.}); do
     ip="${start_ip%.*}.${i}"
     if ping -c 1 -W 1 "$ip" >/dev/null 2>&1; then
         echo "|$ip|사용 중|" >> README.md