diff --git a/src/net.cpp b/src/net.cpp
index 1b8100c5359f0..976bf2bebb882 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -3451,12 +3451,17 @@ std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addres
 
 bool CConnman::AddNode(const AddedNodeParams& add)
 {
-    const CService resolved(LookupNumeric(add.m_added_node, GetDefaultPort(add.m_added_node)));
-    const bool resolved_is_valid{resolved.IsValid()};
+    const CService resolved{MaybeFlipIPv6toCJDNS(LookupNumeric(add.m_added_node, GetDefaultPort(add.m_added_node)))};
+    const bool resolved_invalid{!resolved.IsValid()};
 
     LOCK(m_added_nodes_mutex);
     for (const auto& it : m_added_node_params) {
-        if (add.m_added_node == it.m_added_node || (resolved_is_valid && resolved == LookupNumeric(it.m_added_node, GetDefaultPort(it.m_added_node)))) return false;
+        if (add.m_added_node == it.m_added_node) return false;
+        if (resolved_invalid) continue;
+        const CService service{MaybeFlipIPv6toCJDNS(LookupNumeric(it.m_added_node, GetDefaultPort(it.m_added_node)))};
+        if (resolved == service) return false;
+        // Check if CJDNS address matches regardless of port to detect already-connected inbound peers.
+        if (resolved.IsCJDNS() && static_cast<CNetAddr>(resolved) == static_cast<CNetAddr>(service)) return false;
     }
 
     m_added_node_params.push_back(add);
diff --git a/src/test/net_peer_connection_tests.cpp b/src/test/net_peer_connection_tests.cpp
index 00bc1fdb6afce..d1eebe751b8d6 100644
--- a/src/test/net_peer_connection_tests.cpp
+++ b/src/test/net_peer_connection_tests.cpp
@@ -127,6 +127,15 @@ BOOST_AUTO_TEST_CASE(test_addnode_getaddednodeinfo_and_connection_detection)
     BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"127.1", /*m_use_v2transport=*/true}));
 #endif
 
+    BOOST_TEST_MESSAGE("\nCall AddNode() with a CJDNS service equal to an existing addnode entry; it should not be added");
+    BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"[fc00:3344:5566:7788:9900:aabb:ccdd:eeff]:1234", /*m_use_v2transport=*/false}));
+
+    BOOST_TEST_MESSAGE("\nCall AddNode() with a CJDNS addr equal to an existing inbound one but with a different port specified; it should not be added");
+    BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"[fc00:3344:5566:7788:9900:aabb:ccdd:eeff]:8333", /*m_use_v2transport=*/false}));
+
+    BOOST_TEST_MESSAGE("\nCall AddNode() with a CJDNS addr equal to an existing inbound one but resolving to a different port; it should not be added");
+    BOOST_CHECK(!connman->AddNode({/*m_added_node=*/"fc00:3344:5566:7788:9900:aabb:ccdd:eeff", /*m_use_v2transport=*/false}));
+
     BOOST_TEST_MESSAGE("\nExpect GetAddedNodeInfo to return expected number of peers with `include_connected` true/false");
     BOOST_CHECK_EQUAL(connman->GetAddedNodeInfo(/*include_connected=*/true).size(), nodes.size());
     BOOST_CHECK(connman->GetAddedNodeInfo(/*include_connected=*/false).empty());