diff --git a/src/tcp.cpp b/src/tcp.cpp
index 21f069a..df65e44 100644
--- a/src/tcp.cpp
+++ b/src/tcp.cpp
@@ -128,7 +128,7 @@ void NonBlockingServer::disconnect() {
 // }
 
 [[nodiscard]] std::expected<std::array<char, 16>, int>
-NonBlockingServer::get_client_ip_as_string() const {
+NonBlockingServer::get_client_ip_as_string() {
     std::array<char, 16> addrStr;
 
     if (inet_ntop(AF_INET, &((struct sockaddr_in*)&m_clientAddress)->sin_addr,
@@ -143,11 +143,11 @@ NonBlockingServer::get_client_ip_as_string() const {
     //     return std::unexpected{errno};
     // }
 
-    return {addrStr};
+    return addrStr;
 }
 
 [[nodiscard]] std::expected<int, int>
-NonBlockingServer::send(std::span<const std::byte> data) const {
+NonBlockingServer::send(std::span<const std::byte> data) {
     const int bytesWritten =
         ::send(m_clientSocket, (const char*)data.data(), data.size(), 0);
 
@@ -161,7 +161,7 @@ NonBlockingServer::send(std::span<const std::byte> data) const {
 }
 
 [[nodiscard]] std::expected<int, int>
-NonBlockingServer::recv(std::span<std::byte> buffer) const {
+NonBlockingServer::recv(std::span<std::byte> buffer) {
     const int bytesReceived =
         ::recv(m_clientSocket, (char*)buffer.data(), buffer.size(), 0);
 
diff --git a/src/tcp.hpp b/src/tcp.hpp
index dd4e14a..deb0c0e 100644
--- a/src/tcp.hpp
+++ b/src/tcp.hpp
@@ -39,6 +39,10 @@ struct ServerSettings {
 class NonBlockingServer {
 public:
     NonBlockingServer(ServerSettings settings);
+    NonBlockingServer(const NonBlockingServer&)            = delete;
+    NonBlockingServer(NonBlockingServer&&)                 = delete;
+    NonBlockingServer& operator=(const NonBlockingServer&) = delete;
+    NonBlockingServer& operator=(NonBlockingServer&&)      = delete;
     ~NonBlockingServer();
 
     [[nodiscard]] std::expected<void, int> start_listening();
@@ -48,15 +52,15 @@ public:
     void                                   disconnect();
 
     [[nodiscard]] std::expected<int, int>
-    send(std::span<const std::byte> data) const;
+    send(std::span<const std::byte> data);
 
     [[nodiscard]] std::expected<int, int>
-    recv(std::span<std::byte> buffer) const;
+    recv(std::span<std::byte> buffer);
 
     bool data_available();
 
     [[nodiscard]] std::expected<std::array<char, 16>, int>
-    get_client_ip_as_string() const;
+    get_client_ip_as_string();
 
 private:
     ServerSettings           m_settings;
@@ -86,6 +90,11 @@ private:
 
 class NonBlockingClient {
 public:
+    NonBlockingClient()                                    = default;
+    NonBlockingClient(const NonBlockingClient&)            = delete;
+    NonBlockingClient(NonBlockingClient&&)                 = delete;
+    NonBlockingClient& operator=(const NonBlockingClient&) = delete;
+    NonBlockingClient& operator=(NonBlockingClient&&)      = delete;
     ~NonBlockingClient();
 
     // clang-format off