diff --git a/protocol/Cargo.toml b/protocol/Cargo.toml
index 2bbee0e..cc3ceb6 100644
--- a/protocol/Cargo.toml
+++ b/protocol/Cargo.toml
@@ -11,6 +11,11 @@ rust-version = "1.56"
 homepage = "https://xash.su"
 repository = "https://git.mentality.rip/numas13/xash3d-master"
 
+[features]
+default = ["std"]
+std = ["alloc"]
+alloc = []
+
 [dependencies]
 log = "0.4.18"
 bitflags = "2.4"
diff --git a/protocol/src/color.rs b/protocol/src/color.rs
index 95c977b..c46d1cc 100644
--- a/protocol/src/color.rs
+++ b/protocol/src/color.rs
@@ -3,7 +3,8 @@
 
 //! Color codes for strings.
 
-use std::borrow::Cow;
+#[cfg(feature = "alloc")]
+use alloc::{borrow::Cow, string::String};
 
 /// Color codes `^digit`.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
@@ -131,6 +132,7 @@ impl<'a> Iterator for ColorIter<'a> {
 /// # use xash3d_protocol::color::trim_color;
 /// assert_eq!(trim_color("^1no^7 ^2colors^7"), "no colors");
 /// ```
+#[cfg(feature = "alloc")]
 pub fn trim_color(s: &str) -> Cow<'_, str> {
     let (_, s) = trim_start_color(s);
     if !s.chars().any(|c| c == '^') {
@@ -157,6 +159,7 @@ mod tests {
         assert_eq!(trim_start_color("^1^2^3foo^2bar"), ("^3", "foo^2bar"));
     }
 
+    #[cfg(feature = "alloc")]
     #[test]
     fn trim_colors() {
         assert_eq!(trim_color("foo^2bar"), "foobar");
diff --git a/protocol/src/cursor.rs b/protocol/src/cursor.rs
index 1902064..f0aeafb 100644
--- a/protocol/src/cursor.rs
+++ b/protocol/src/cursor.rs
@@ -1,11 +1,14 @@
 // SPDX-License-Identifier: LGPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
-use std::{
+use core::{
     fmt::{self, Write},
     mem, str,
 };
 
+#[cfg(feature = "alloc")]
+use alloc::{borrow::ToOwned, boxed::Box, string::String};
+
 use super::color;
 use super::wrappers::Str;
 
@@ -49,9 +52,9 @@ impl fmt::Display for CursorError {
     }
 }
 
-impl std::error::Error for CursorError {}
+impl core::error::Error for CursorError {}
 
-pub type Result<T, E = CursorError> = std::result::Result<T, E>;
+pub type Result<T, E = CursorError> = core::result::Result<T, E>;
 
 pub trait GetKeyValue<'a>: Sized {
     fn get_key_value(cur: &mut Cursor<'a>) -> Result<Self>;
@@ -76,6 +79,7 @@ impl<'a> GetKeyValue<'a> for &'a str {
     }
 }
 
+#[cfg(feature = "alloc")]
 impl<'a> GetKeyValue<'a> for Box<str> {
     fn get_key_value(cur: &mut Cursor<'a>) -> Result<Self> {
         let raw = cur.get_key_value_raw()?;
@@ -85,6 +89,7 @@ impl<'a> GetKeyValue<'a> for Box<str> {
     }
 }
 
+#[cfg(feature = "alloc")]
 impl<'a> GetKeyValue<'a> for String {
     fn get_key_value(cur: &mut Cursor<'a>) -> Result<Self> {
         let raw = cur.get_key_value_raw()?;
diff --git a/protocol/src/filter.rs b/protocol/src/filter.rs
index 135dc9e..3235d2d 100644
--- a/protocol/src/filter.rs
+++ b/protocol/src/filter.rs
@@ -29,16 +29,16 @@
 //! * Do not have bots
 //! * Is not protected by a password
 
-use std::fmt;
-use std::net::SocketAddr;
-use std::str::FromStr;
+use core::{fmt, net::SocketAddr, str::FromStr};
 
 use bitflags::bitflags;
 
-use crate::cursor::{Cursor, GetKeyValue, PutKeyValue};
-use crate::server::{ServerAdd, ServerFlags, ServerType};
-use crate::wrappers::Str;
-use crate::{CursorError, Error, ServerInfo};
+use crate::{
+    cursor::{Cursor, GetKeyValue, PutKeyValue},
+    server::{ServerAdd, ServerFlags, ServerType},
+    wrappers::Str,
+    ServerInfo, {CursorError, Error},
+};
 
 bitflags! {
     /// Additional filter flags.
@@ -196,11 +196,14 @@ impl Filter<'_> {
     }
 
     /// Returns `true` if a server matches the filter.
-    pub fn matches(&self, _addr: SocketAddr, info: &ServerInfo) -> bool {
+    pub fn matches<T>(&self, _addr: SocketAddr, info: &ServerInfo<T>) -> bool
+    where
+        T: AsRef<[u8]>,
+    {
         // TODO: match addr
         !((info.flags & self.flags_mask) != self.flags
-            || self.gamedir.map_or(false, |s| *s != &*info.gamedir)
-            || self.map.map_or(false, |s| *s != &*info.map)
+            || self.gamedir.map_or(false, |s| *s != info.gamedir.as_ref())
+            || self.map.map_or(false, |s| *s != info.map.as_ref())
             || self.protocol.map_or(false, |s| s != info.protocol))
     }
 }
@@ -306,11 +309,14 @@ impl fmt::Display for &Filter<'_> {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-    use crate::cursor::CursorMut;
-    use crate::wrappers::Str;
     use std::net::SocketAddr;
 
+    use crate::{cursor::CursorMut, wrappers::Str};
+
+    use super::*;
+
+    type ServerInfo = crate::ServerInfo<Box<[u8]>>;
+
     macro_rules! tests {
         ($($name:ident$(($($predefined_f:ident: $predefined_v:expr),+ $(,)?))? {
             $($src:expr => {
diff --git a/protocol/src/game.rs b/protocol/src/game.rs
index 1d4819d..b0b7f12 100644
--- a/protocol/src/game.rs
+++ b/protocol/src/game.rs
@@ -3,8 +3,7 @@
 
 //! Game client packets.
 
-use std::fmt;
-use std::net::SocketAddr;
+use core::{fmt, net::SocketAddr};
 
 use crate::cursor::{Cursor, CursorMut};
 use crate::filter::Filter;
@@ -129,10 +128,14 @@ impl<'a> Packet<'a> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::filter::{FilterFlags, Version};
-    use crate::wrappers::Str;
+
     use std::net::{IpAddr, Ipv4Addr};
 
+    use crate::{
+        filter::{FilterFlags, Version},
+        wrappers::Str,
+    };
+
     #[test]
     fn query_servers() {
         let p = QueryServers {
diff --git a/protocol/src/lib.rs b/protocol/src/lib.rs
index 0fd2dfe..edd3adf 100644
--- a/protocol/src/lib.rs
+++ b/protocol/src/lib.rs
@@ -6,6 +6,11 @@
 
 //! Xash3D protocol between clients, servers and masters.
 
+#![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
+
+#[cfg(feature = "alloc")]
+extern crate alloc;
+
 #[macro_use]
 extern crate log;
 
@@ -20,7 +25,7 @@ pub mod master;
 pub mod server;
 pub mod wrappers;
 
-use std::fmt;
+use core::fmt;
 
 pub use cursor::CursorError;
 pub use server_info::ServerInfo;
@@ -76,7 +81,7 @@ impl fmt::Display for Error {
     }
 }
 
-impl std::error::Error for Error {}
+impl core::error::Error for Error {}
 
 impl From<CursorError> for Error {
     fn from(source: CursorError) -> Self {
diff --git a/protocol/src/master.rs b/protocol/src/master.rs
index 7af6c9e..8263336 100644
--- a/protocol/src/master.rs
+++ b/protocol/src/master.rs
@@ -3,7 +3,7 @@
 
 //! Master server packets.
 
-use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
+use core::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
 
 use super::cursor::{Cursor, CursorMut};
 use super::Error;
@@ -143,7 +143,7 @@ impl<'a> QueryServersResponse<&'a [u8]> {
         A: ServerAddress,
     {
         let mut cur = Cursor::new(self.inner);
-        std::iter::from_fn(move || {
+        core::iter::from_fn(move || {
             if cur.remaining() == A::size() && cur.end().ends_with(&[0; 2]) {
                 // skip last address with port 0
                 return None;
diff --git a/protocol/src/server.rs b/protocol/src/server.rs
index 231d7b4..bbd7421 100644
--- a/protocol/src/server.rs
+++ b/protocol/src/server.rs
@@ -3,7 +3,7 @@
 
 //! Game server packets.
 
-use std::fmt;
+use core::fmt;
 
 use bitflags::bitflags;
 
diff --git a/protocol/src/server_info.rs b/protocol/src/server_info.rs
index fdb163b..73be80b 100644
--- a/protocol/src/server_info.rs
+++ b/protocol/src/server_info.rs
@@ -1,28 +1,46 @@
 // SPDX-License-Identifier: LGPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+#[cfg(feature = "alloc")]
+use alloc::boxed::Box;
+
 use super::filter::{FilterFlags, Version};
 use super::server::{Region, ServerAdd};
 use super::wrappers::Str;
 
 /// Game server information.
 #[derive(Clone, Debug)]
-pub struct ServerInfo {
+pub struct ServerInfo<T> {
     /// Server version.
     pub version: Version,
     /// Server protocol version.
     pub protocol: u8,
     /// Server midification.
-    pub gamedir: Box<[u8]>,
+    pub gamedir: T,
     /// Server map.
-    pub map: Box<[u8]>,
+    pub map: T,
     /// Server additional filter flags.
     pub flags: FilterFlags,
     /// Server region.
     pub region: Region,
 }
 
-impl ServerInfo {
+impl<'a> ServerInfo<&'a [u8]> {
+    /// Creates a new `ServerInfo`.
+    pub fn new(info: &ServerAdd<Str<&'a [u8]>>) -> Self {
+        Self {
+            version: info.version,
+            protocol: info.protocol,
+            gamedir: &info.gamedir,
+            map: &info.map,
+            flags: FilterFlags::from(info),
+            region: info.region,
+        }
+    }
+}
+
+#[cfg(any(feature = "alloc", test))]
+impl ServerInfo<Box<[u8]>> {
     /// Creates a new `ServerInfo`.
     pub fn new(info: &ServerAdd<Str<&[u8]>>) -> Self {
         Self {
diff --git a/protocol/src/wrappers.rs b/protocol/src/wrappers.rs
index 4a57e67..cd11187 100644
--- a/protocol/src/wrappers.rs
+++ b/protocol/src/wrappers.rs
@@ -3,11 +3,9 @@
 
 //! Wrappers for byte slices with pretty-printers.
 
-use std::fmt;
-use std::ops::Deref;
+use core::{fmt, ops::Deref};
 
-use crate::cursor::{CursorMut, PutKeyValue};
-use crate::CursorError;
+use crate::cursor::{CursorError, CursorMut, PutKeyValue};
 
 /// Wrapper for slice of bytes with printing the bytes as a string.
 ///