diff --git a/core/src/main/java/google/registry/flows/host/HostFlowUtils.java b/core/src/main/java/google/registry/flows/host/HostFlowUtils.java
index d104264e4c2..447f2176de4 100644
--- a/core/src/main/java/google/registry/flows/host/HostFlowUtils.java
+++ b/core/src/main/java/google/registry/flows/host/HostFlowUtils.java
@@ -116,15 +116,21 @@ public static void validateInetAddresses(ImmutableSet<InetAddress> inetAddresses
     if (inetAddresses == null) {
       return;
     }
-    if (inetAddresses.stream().anyMatch(InetAddress::isLoopbackAddress)) {
-      throw new LoopbackIpNotValidForHostException();
+    for (InetAddress inetAddress : inetAddresses) {
+      if (inetAddress.isLoopbackAddress()
+          || inetAddress.isLinkLocalAddress()
+          || inetAddress.isSiteLocalAddress()
+          || inetAddress.isAnyLocalAddress()
+          || inetAddress.isMulticastAddress()) {
+        throw new IpAddressNotRoutableException(inetAddress.getHostAddress());
+      }
     }
   }
 
-  /** Loopback IPs are not valid for hosts. */
-  static class LoopbackIpNotValidForHostException extends ParameterValuePolicyErrorException {
-    public LoopbackIpNotValidForHostException() {
-      super("Loopback IPs are not valid for hosts");
+  /** IP address is not a public, routable address. */
+  static class IpAddressNotRoutableException extends ParameterValuePolicyErrorException {
+    public IpAddressNotRoutableException(String ipAddress) {
+      super(String.format("IP address %s is not a public, globally routable address", ipAddress));
     }
   }
 
diff --git a/core/src/test/java/google/registry/flows/host/HostCreateFlowTest.java b/core/src/test/java/google/registry/flows/host/HostCreateFlowTest.java
index 12e04d1f14f..6ac065e64a3 100644
--- a/core/src/test/java/google/registry/flows/host/HostCreateFlowTest.java
+++ b/core/src/test/java/google/registry/flows/host/HostCreateFlowTest.java
@@ -48,7 +48,7 @@
 import google.registry.flows.host.HostFlowUtils.HostNameTooLongException;
 import google.registry.flows.host.HostFlowUtils.HostNameTooShallowException;
 import google.registry.flows.host.HostFlowUtils.InvalidHostNameException;
-import google.registry.flows.host.HostFlowUtils.LoopbackIpNotValidForHostException;
+import google.registry.flows.host.HostFlowUtils.IpAddressNotRoutableException;
 import google.registry.flows.host.HostFlowUtils.SuperordinateDomainDoesNotExistException;
 import google.registry.flows.host.HostFlowUtils.SuperordinateDomainInPendingDeleteException;
 import google.registry.model.ForeignKeyUtils;
@@ -354,22 +354,62 @@ void testFailure_ccTldInBailiwick() {
   }
 
   @Test
-  void testFailure_localhostInetAddress_ipv4() {
+  void testFailure_loopbackInetAddress_ipv4() {
     createTld("tld");
     persistActiveDomain("example.tld");
     setEppHostCreateInput("ns1.example.tld", "<host:addr ip=\"v4\">127.0.0.1</host:addr>");
     assertAboutEppExceptions()
-        .that(assertThrows(LoopbackIpNotValidForHostException.class, this::runFlow))
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
         .marshalsToXml();
   }
 
   @Test
-  void testFailure_localhostInetAddress_ipv6() {
+  void testFailure_loopbackInetAddress_ipv6() {
     createTld("tld");
     persistActiveDomain("example.tld");
     setEppHostCreateInput("ns1.example.tld", "<host:addr ip=\"v6\">::1</host:addr>");
     assertAboutEppExceptions()
-        .that(assertThrows(LoopbackIpNotValidForHostException.class, this::runFlow))
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_linkLocalInetAddress_ipv4() {
+    createTld("tld");
+    persistActiveDomain("example.tld");
+    setEppHostCreateInput("ns1.example.tld", "<host:addr ip=\"v4\">169.254.1.1</host:addr>");
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_linkLocalInetAddress_ipv6() {
+    createTld("tld");
+    persistActiveDomain("example.tld");
+    setEppHostCreateInput("ns1.example.tld", "<host:addr ip=\"v6\">fe80::1</host:addr>");
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_privateInetAddress_ipv4() {
+    createTld("tld");
+    persistActiveDomain("example.tld");
+    setEppHostCreateInput("ns1.example.tld", "<host:addr ip=\"v4\">192.168.1.1</host:addr>");
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_anyLocalInetAddress_ipv4() {
+    createTld("tld");
+    persistActiveDomain("example.tld");
+    setEppHostCreateInput("ns1.example.tld", "<host:addr ip=\"v4\">0.0.0.0</host:addr>");
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
         .marshalsToXml();
   }
 
diff --git a/core/src/test/java/google/registry/flows/host/HostUpdateFlowTest.java b/core/src/test/java/google/registry/flows/host/HostUpdateFlowTest.java
index 5848205755a..4c5890df678 100644
--- a/core/src/test/java/google/registry/flows/host/HostUpdateFlowTest.java
+++ b/core/src/test/java/google/registry/flows/host/HostUpdateFlowTest.java
@@ -65,7 +65,7 @@
 import google.registry.flows.host.HostFlowUtils.HostNameNotPunyCodedException;
 import google.registry.flows.host.HostFlowUtils.HostNameTooLongException;
 import google.registry.flows.host.HostFlowUtils.HostNameTooShallowException;
-import google.registry.flows.host.HostFlowUtils.LoopbackIpNotValidForHostException;
+import google.registry.flows.host.HostFlowUtils.IpAddressNotRoutableException;
 import google.registry.flows.host.HostFlowUtils.SuperordinateDomainDoesNotExistException;
 import google.registry.flows.host.HostFlowUtils.SuperordinateDomainInPendingDeleteException;
 import google.registry.flows.host.HostUpdateFlow.CannotAddIpToExternalHostException;
@@ -1391,24 +1391,68 @@ void testFailure_ccTldInBailiwick() throws Exception {
   }
 
   @Test
-  void testFailure_localhostInetAddress_ipv4() throws Exception {
+  void testFailure_loopbackInetAddress_ipv4() throws Exception {
     createTld("tld");
     persistActiveSubordinateHost(oldHostName(), persistActiveDomain("example.tld"));
     setEppHostUpdateInput(
         "ns1.example.tld", "ns2.example.tld", "<host:addr ip=\"v4\">127.0.0.1</host:addr>", null);
     assertAboutEppExceptions()
-        .that(assertThrows(LoopbackIpNotValidForHostException.class, this::runFlow))
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
         .marshalsToXml();
   }
 
   @Test
-  void testFailure_localhostInetAddress_ipv6() throws Exception {
+  void testFailure_loopbackInetAddress_ipv6() throws Exception {
     createTld("tld");
     persistActiveSubordinateHost(oldHostName(), persistActiveDomain("example.tld"));
     setEppHostUpdateInput(
         "ns1.example.tld", "ns2.example.tld", "<host:addr ip=\"v6\">::1</host:addr>", null);
     assertAboutEppExceptions()
-        .that(assertThrows(LoopbackIpNotValidForHostException.class, this::runFlow))
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_linkLocalInetAddress_ipv4() throws Exception {
+    createTld("tld");
+    persistActiveSubordinateHost(oldHostName(), persistActiveDomain("example.tld"));
+    setEppHostUpdateInput(
+        "ns1.example.tld", "ns2.example.tld", "<host:addr ip=\"v4\">169.254.1.1</host:addr>", null);
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_linkLocalInetAddress_ipv6() throws Exception {
+    createTld("tld");
+    persistActiveSubordinateHost(oldHostName(), persistActiveDomain("example.tld"));
+    setEppHostUpdateInput(
+        "ns1.example.tld", "ns2.example.tld", "<host:addr ip=\"v6\">fe80::1</host:addr>", null);
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_privateInetAddress_ipv4() throws Exception {
+    createTld("tld");
+    persistActiveSubordinateHost(oldHostName(), persistActiveDomain("example.tld"));
+    setEppHostUpdateInput(
+        "ns1.example.tld", "ns2.example.tld", "<host:addr ip=\"v4\">192.168.1.1</host:addr>", null);
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
+        .marshalsToXml();
+  }
+
+  @Test
+  void testFailure_anyLocalInetAddress_ipv4() throws Exception {
+    createTld("tld");
+    persistActiveSubordinateHost(oldHostName(), persistActiveDomain("example.tld"));
+    setEppHostUpdateInput(
+        "ns1.example.tld", "ns2.example.tld", "<host:addr ip=\"v4\">0.0.0.0</host:addr>", null);
+    assertAboutEppExceptions()
+        .that(assertThrows(IpAddressNotRoutableException.class, this::runFlow))
         .marshalsToXml();
   }