diff --git a/ARP/src/ARP_TABLE.java b/ARP/src/ARP_TABLE.java
new file mode 100644
index 0000000..6fdc949
--- /dev/null
+++ b/ARP/src/ARP_TABLE.java
@@ -0,0 +1,43 @@
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.Iterator;
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class ARP_TABLE {
+    public static HashMap<String, byte[]> arptable = new Hashtable<>();
+
+    public static void arp_table_remove_all() {
+        arptable = new Hashtable();
+        // 제거 후 업데이트
+    }
+
+    public static void arp_table_remove() {
+
+        // remove 구현
+    }
+
+    public void checkingput(string src, byte[] value) {
+
+        if (arptable.containsKey(src)) {
+            byte[] macadd = arptable.get(src);
+            if (macadd != -1) {
+                set<string> str = arptable.keySet();
+                for (string key : str) {
+                    if (Arrays.equals(arptable.get(key), macadd)) {
+                        arptable.replace(key, value);
+                    }
+                }
+            }
+            arptable.replace(src, value);
+            // 키 값이 있다면? 새롭게 업데이트
+        } else {
+            arptable.put(src, value);
+            // 키 값이 없다면? 새롭게 추가
+        }
+
+    }
+
+}
\ No newline at end of file