diff --git a/src/core/net/dnssd_server.cpp b/src/core/net/dnssd_server.cpp
index f415f966dff..1bfc9f16669 100644
--- a/src/core/net/dnssd_server.cpp
+++ b/src/core/net/dnssd_server.cpp
@@ -666,11 +666,6 @@ void Server::Response::IncResourceRecordCount(void)
     }
 }
 
-uint8_t Server::GetNameLength(const char *aName)
-{
-    return static_cast<uint8_t>(StringLength(aName, Name::kMaxNameLength));
-}
-
 #if OT_SHOULD_LOG_AT(OT_LOG_LEVEL_INFO)
 void Server::Response::Log(void) const
 {
diff --git a/src/core/net/dnssd_server.hpp b/src/core/net/dnssd_server.hpp
index 3b6b67993b9..4afde1d7dba 100644
--- a/src/core/net/dnssd_server.hpp
+++ b/src/core/net/dnssd_server.hpp
@@ -397,11 +397,10 @@ class Server : public InstanceLocator, private NonCopyable
         NameOffsets      mOffsets;
     };
 
-    bool           IsRunning(void) const { return mSocket.IsBound(); }
-    static void    HandleUdpReceive(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo);
-    void           HandleUdpReceive(Message &aMessage, const Ip6::MessageInfo &aMessageInfo);
-    void           ProcessQuery(Request &aRequest);
-    static uint8_t GetNameLength(const char *aName);
+    bool        IsRunning(void) const { return mSocket.IsBound(); }
+    static void HandleUdpReceive(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo);
+    void        HandleUdpReceive(Message &aMessage, const Ip6::MessageInfo &aMessageInfo);
+    void        ProcessQuery(Request &aRequest);
 
     void        ResolveByProxy(Response &aResponse, const Ip6::MessageInfo &aMessageInfo);
     void        RemoveQueryAndPrepareResponse(ProxyQuery &aQuery, const ProxyQueryInfo &aInfo, Response &aResponse);