diff --git a/TESTS/netsocket/tcp/main.cpp b/TESTS/netsocket/tcp/main.cpp
index ba1e587580..3988711f76 100644
--- a/TESTS/netsocket/tcp/main.cpp
+++ b/TESTS/netsocket/tcp/main.cpp
@@ -93,6 +93,7 @@ void greentea_teardown(const size_t passed, const size_t failed, const failure_t
 Case cases[] = {
     Case("Echo burst", test_tcpsocket_echotest_burst),
     Case("Echo burst non-block", test_tcpsocket_echotest_burst_nonblock),
+    Case("Open at least 4 sockets", test_tcpsocket_open_limit),
     Case("Receive 100k from CHARGEN service", test_tcpsocket_recv_100k),
     Case("Receive 100k from CHARGEN service non-block", test_tcpsocket_recv_100k_nonblock),
     Case("Receive in given time", test_tcpsocket_recv_timeout),
diff --git a/TESTS/netsocket/tcp/tcp_tests.h b/TESTS/netsocket/tcp/tcp_tests.h
index 623bc7b99f..a62f153141 100644
--- a/TESTS/netsocket/tcp/tcp_tests.h
+++ b/TESTS/netsocket/tcp/tcp_tests.h
@@ -28,6 +28,7 @@ void fill_tx_buffer_ascii(char *buff, size_t len);
 void test_tcpsocket_echotest_burst();
 void test_tcpsocket_echotest_burst_nonblock();
 void test_tcpsocket_endpoint_close();
+void test_tcpsocket_open_limit();
 void test_tcpsocket_recv_100k();
 void test_tcpsocket_recv_100k_nonblock();
 void test_tcpsocket_recv_timeout();
diff --git a/TESTS/netsocket/tcp/tcpsocket_open_limit.cpp b/TESTS/netsocket/tcp/tcpsocket_open_limit.cpp
new file mode 100644
index 0000000000..f2493d86c1
--- /dev/null
+++ b/TESTS/netsocket/tcp/tcpsocket_open_limit.cpp
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2018, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed 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.
+ */
+
+#include "greentea-client/test_env.h"
+#include "mbed.h"
+#include MBED_CONF_APP_HEADER_FILE
+#include "tcp_tests.h"
+#include "TCPSocket.h"
+#include "unity/unity.h"
+#include "utest.h"
+
+using namespace utest::v1;
+
+namespace
+{
+    typedef struct TCPSocketItem {
+        TCPSocket *sock;
+        TCPSocketItem *next;
+    } SocketItem;
+}
+
+void test_tcpsocket_open_limit()
+{
+    int open_sockets[2] = {0};
+
+    for (int i = 0; i < 2; i++) {
+        TCPSocketItem *socket_list_head = NULL;
+        TCPSocketItem *it;
+
+        TCPSocket *sock;
+        int ret;
+        while (true) {
+            sock = new TCPSocket;
+            if (!sock) {
+                break;
+            }
+            ret = sock->open(get_interface());
+            if (ret == NSAPI_ERROR_NO_MEMORY || ret == NSAPI_ERROR_NO_SOCKET) {
+                printf("[round#%02d] unable to open new socket, error: %d\n", i, ret);
+                delete sock;
+                break;
+            }
+
+            // Hopefully this doesn't interfere when trying to allocate more sockets
+            it = new TCPSocketItem;
+            if (!it) {
+                delete sock;
+                break;
+            }
+
+            it->sock = sock;
+            // Order of items in the list doesn't matter
+            it->next = socket_list_head;
+            socket_list_head = it;
+        }
+
+        if (!socket_list_head) {
+            break;
+        }
+
+        TCPSocketItem *tmp;
+        for(TCPSocketItem *it = socket_list_head; it;) {
+            ++open_sockets[i];
+            tmp = it;
+            it = it->next;
+            socket_list_head = it;
+            delete tmp->sock;
+            delete tmp;
+        }
+        printf("[round#%02d] %d sockets opened\n", i, open_sockets[i]);
+    }
+    TEST_ASSERT_EQUAL(open_sockets[0], open_sockets[1]);
+    TEST_ASSERT(open_sockets[0] >= 4);
+}
diff --git a/TESTS/netsocket/udp/main.cpp b/TESTS/netsocket/udp/main.cpp
index 86573d625d..4d86c96fbd 100644
--- a/TESTS/netsocket/udp/main.cpp
+++ b/TESTS/netsocket/udp/main.cpp
@@ -80,6 +80,7 @@ void greentea_teardown(const size_t passed, const size_t failed, const failure_t
 Case cases[] = {
         Case("Echo burst", test_udpsocket_echotest_burst),
         Case("Echo burst non-block", test_udpsocket_echotest_burst_nonblock),
+        Case("Open at least 3 sockets", test_udpsocket_open_limit),
         Case("Receive in given time", test_udpsocket_recv_timeout),
         Case("Send in given time", test_udpsocket_sendto_timeout),
 
diff --git a/TESTS/netsocket/udp/udp_tests.h b/TESTS/netsocket/udp/udp_tests.h
index a18e30ed9f..ba33fa41fc 100644
--- a/TESTS/netsocket/udp/udp_tests.h
+++ b/TESTS/netsocket/udp/udp_tests.h
@@ -26,6 +26,7 @@ void fill_tx_buffer_ascii(char *buff, size_t len);
  */
 void test_udpsocket_echotest_burst();
 void test_udpsocket_echotest_burst_nonblock();
+void test_udpsocket_open_limit();
 void test_udpsocket_recv_timeout();
 void test_udpsocket_sendto_timeout();
 
diff --git a/TESTS/netsocket/udp/udpsocket_open_limit.cpp b/TESTS/netsocket/udp/udpsocket_open_limit.cpp
new file mode 100644
index 0000000000..d8cc96c458
--- /dev/null
+++ b/TESTS/netsocket/udp/udpsocket_open_limit.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2018, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed 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.
+ */
+
+#include "greentea-client/test_env.h"
+#include "mbed.h"
+#include MBED_CONF_APP_HEADER_FILE
+#include "udp_tests.h"
+#include "UDPSocket.h"
+#include "unity/unity.h"
+#include "utest.h"
+
+using namespace utest::v1;
+
+namespace
+{
+    typedef struct UDPSocketItem {
+        UDPSocket *sock;
+        UDPSocketItem *next;
+    } SocketItem;
+}
+
+void test_udpsocket_open_limit()
+{
+    int open_sockets[2] = {0};
+
+    for (int i = 0; i < 2; i++) {
+        UDPSocketItem *socket_list_head = NULL;
+        UDPSocketItem *it;
+
+        UDPSocket *sock;
+        int ret;
+        while (true) {
+            sock = new UDPSocket;
+            if (!sock) {
+                break;
+            }
+            ret = sock->open(get_interface());
+            if (ret == NSAPI_ERROR_NO_MEMORY || ret == NSAPI_ERROR_NO_SOCKET) {
+                printf("[round#%02d] unable to open new socket, error: %d\n", i, ret);
+                delete sock;
+                break;
+            }
+
+            // Hopefully this doesn't interfere when trying to allocate more sockets
+            it = new UDPSocketItem;
+            if (!it) {
+                delete sock;
+                break;
+            }
+
+            it->sock = sock;
+            // Order of items in the list doesn't matter
+            it->next = socket_list_head;
+            socket_list_head = it;
+        }
+
+        if (!socket_list_head) {
+            break;
+        }
+
+        UDPSocketItem *tmp;
+        for(UDPSocketItem *it = socket_list_head; it;) {
+            ++open_sockets[i];
+            tmp = it;
+            it = it->next;
+            socket_list_head = it;
+            delete tmp->sock;
+            delete tmp;
+        }
+        printf("[round#%02d] %d sockets opened\n", i, open_sockets[i]);
+    }
+    TEST_ASSERT_EQUAL(open_sockets[0], open_sockets[1]);
+    // In case of lwIP one is taken by DHCP -> reduction by one to three
+    TEST_ASSERT(open_sockets[0] >= 3);
+}