diff --git a/test/jdk/java/net/HttpURLConnection/HttpURLConWithProxy.java b/test/jdk/java/net/HttpURLConnection/HttpURLConWithProxy.java
index 53d74d06c2e..9de4bff1d7b 100644
--- a/test/jdk/java/net/HttpURLConnection/HttpURLConWithProxy.java
+++ b/test/jdk/java/net/HttpURLConnection/HttpURLConWithProxy.java
@@ -55,7 +55,8 @@ public class HttpURLConWithProxy {
         // Remove the default nonProxyHosts to use localhost for testing
         System.setProperty("http.nonProxyHosts", "");
 
-        System.setProperty("http.proxyHost", "1.1.1.1");
+        // 240.0.0.0/4 is unallocated and "reserved for future use" (RFC 1112, Section 4)
+        System.setProperty("http.proxyHost", "240.0.0.1");
         System.setProperty("http.proxyPort", "1111");
 
         // Use the logger to help verify the Proxy was used
@@ -131,8 +132,9 @@ class MyProxySelector extends ProxySelector {
     List<Proxy> proxies = new ArrayList<>();
 
     MyProxySelector() {
-        Proxy p1 = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("2.2.2.2", 2222));
-        Proxy p2 = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("3.3.3.3", 3333));
+        // 240.0.0.0/4 is unallocated and "reserved for future use" (RFC 1112, Section 4)
+        Proxy p1 = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("240.0.0.2", 2222));
+        Proxy p2 = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("240.0.0.3", 3333));
         proxies.add(p1);
         proxies.add(p2);
     }