diff --git a/src/core/net/nat64_translator.cpp b/src/core/net/nat64_translator.cpp
index d38a34f64..040593599 100644
--- a/src/core/net/nat64_translator.cpp
+++ b/src/core/net/nat64_translator.cpp
@@ -348,7 +348,12 @@ Translator::Mapping::InfoString Translator::Mapping::ToString(void) const
 {
     InfoString string;
 
+#if OPENTHREAD_CONFIG_NAT64_PORT_TRANSLATION_ENABLE
+    string.Append("%s,%u -> %s,%u", mIp6Address.ToString().AsCString(), mSrcPortOrId,
+                  mIp4Address.ToString().AsCString(), mTranslatedPortOrId);
+#else
     string.Append("%s -> %s", mIp6Address.ToString().AsCString(), mIp4Address.ToString().AsCString());
+#endif
 
     return string;
 }
diff --git a/src/core/net/nat64_translator.hpp b/src/core/net/nat64_translator.hpp
index fc49ff0db..792c41ebf 100644
--- a/src/core/net/nat64_translator.hpp
+++ b/src/core/net/nat64_translator.hpp
@@ -323,7 +323,7 @@ private:
 
     struct Mapping : public InstanceLocatorInit, public LinkedListEntry<Mapping>
     {
-        static constexpr uint16_t kInfoStringSize = 70;
+        static constexpr uint16_t kInfoStringSize = 80;
 
         typedef String<kInfoStringSize> InfoString;