diff --git a/zookeeper-server/zookeeper-server-3.9.3/src/main/java/org/apache/zookeeper/common/NetUtils.java b/zookeeper-server/zookeeper-server-3.9.3/src/main/java/org/apache/zookeeper/common/NetUtils.java
deleted file mode 100644
index baa69f12968a..000000000000
--- a/zookeeper-server/zookeeper-server-3.9.3/src/main/java/org/apache/zookeeper/common/NetUtils.java
+++ /dev/null
@@ -1,94 +0,0 @@
-// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.zookeeper.common;
-
-import java.net.Inet6Address;
-import java.net.InetAddress;
-import java.net.InetSocketAddress;
-
-/**
- * This class contains common utilities for netstuff. Like printing IPv6 literals correctly
- */
-public class NetUtils {
-
-    // Note: Changed from original to use hostname from InetSocketAddress if there exists one
-    public static String formatInetAddr(InetSocketAddress addr) {
-        String hostName = addr.getHostName();
-        if (hostName != null) {
-            return String.format("%s:%s", hostName, addr.getPort());
-        }
-
-        InetAddress ia = addr.getAddress();
-
-        if (ia == null) {
-            return String.format("%s:%s", addr.getHostString(), addr.getPort());
-        }
-        if (ia instanceof Inet6Address) {
-            return String.format("[%s]:%s", ia.getHostAddress(), addr.getPort());
-        } else {
-            return String.format("%s:%s", ia.getHostAddress(), addr.getPort());
-        }
-    }
-
-    /**
-     * Separates host and port from given host port string if host port string is enclosed
-     * within square bracket.
-     *
-     * @param hostPort host port string
-     * @return String[]{host, port} if host port string is host:port
-     * or String[] {host, port:port} if host port string is host:port:port
-     * or String[] {host} if host port string is host
-     * or String[]{} if not a ipv6 host port string.
-     */
-    public static String[] getIPV6HostAndPort(String hostPort) {
-        if (hostPort.startsWith("[")) {
-            int i = hostPort.lastIndexOf(']');
-            if (i < 0) {
-                throw new IllegalArgumentException(
-                    hostPort + " starts with '[' but has no matching ']'");
-            }
-            String host = hostPort.substring(1, i);
-            if (host.isEmpty()) {
-                throw new IllegalArgumentException(host + " is empty.");
-            }
-            if (hostPort.length() > i + 1) {
-                return getHostPort(hostPort, i, host);
-            }
-            return new String[] { host };
-        } else {
-            //Not an IPV6 host port string
-            return new String[] {};
-        }
-    }
-
-    private static String[] getHostPort(String hostPort, int indexOfClosingBracket, String host) {
-        // [127::1]:2181 , check separator : exits
-        if (hostPort.charAt(indexOfClosingBracket + 1) != ':') {
-            throw new IllegalArgumentException(hostPort + " does not have : after ]");
-        }
-        // [127::1]: scenario
-        if (indexOfClosingBracket + 2 == hostPort.length()) {
-            throw new IllegalArgumentException(hostPort + " doesn't have a port after colon.");
-        }
-        //do not include
-        String port = hostPort.substring(indexOfClosingBracket + 2);
-        return new String[] { host, port };
-    }
-}