diff --git a/crates/lavina-core/src/player.rs b/crates/lavina-core/src/player.rs
index 30635b0..f14da4b 100644
--- a/crates/lavina-core/src/player.rs
+++ b/crates/lavina-core/src/player.rs
@@ -8,6 +8,7 @@
 //! A player actor is a serial handler of commands from a single player. It is preferable to run all per-player validations in the player actor,
 //! so that they don't overload the room actor.
 use std::collections::{HashMap, HashSet};
+use std::ops::Deref;
 use std::sync::Arc;
 
 use chrono::{DateTime, Utc};
@@ -124,6 +125,15 @@ impl PlayerConnection {
         self.player_handle.send(ActorCommand::ClientCommand(cmd, self.connection_id.clone())).await;
         Ok(deferred.await?)
     }
+
+    /// Handler in [Player::check_user_existance].
+    #[tracing::instrument(skip(self), name = "PlayerConnection::send_dialog_message")]
+    pub async fn check_user_existance(&self, recipient: PlayerId) -> Result<GetInfoResult> {
+        let (promise, deferred) = oneshot();
+        let cmd = ClientCommand::GetInfo { recipient, promise };
+        self.player_handle.send(ActorCommand::ClientCommand(cmd, self.connection_id.clone())).await;
+        Ok(deferred.await?)
+    }
 }
 
 /// Handle to a player actor.
@@ -200,6 +210,15 @@ pub enum ClientCommand {
         body: Str,
         promise: Promise<()>,
     },
+    GetInfo {
+        recipient: PlayerId,
+        promise: Promise<GetInfoResult>,
+    },
+}
+
+pub enum GetInfoResult {
+    UserExists,
+    UserDoesntExist,
 }
 
 pub enum JoinResult {
@@ -500,6 +519,10 @@ impl Player {
                 self.send_dialog_message(connection_id, recipient, body).await;
                 let _ = promise.send(());
             }
+            ClientCommand::GetInfo { recipient, promise } => {
+                let result = self.check_user_existance(recipient).await;
+                let _ = promise.send(result);
+            }
         }
     }
 
@@ -596,6 +619,15 @@ impl Player {
         self.broadcast_update(update, connection_id).await;
     }
 
+    #[tracing::instrument(skip(self), name = "Player::check_user_existance")]
+    async fn check_user_existance(&self, recipient: PlayerId) -> GetInfoResult {
+        if self.storage.check_user_existance(recipient.as_inner().as_ref()).await.unwrap() {
+            GetInfoResult::UserExists
+        } else {
+            GetInfoResult::UserDoesntExist
+        }
+    }
+
     /// Broadcasts an update to all connections except the one with the given id.
     ///
     /// This is called after handling a client command.
diff --git a/crates/lavina-core/src/repo/mod.rs b/crates/lavina-core/src/repo/mod.rs
index f0d210c..a1057af 100644
--- a/crates/lavina-core/src/repo/mod.rs
+++ b/crates/lavina-core/src/repo/mod.rs
@@ -7,7 +7,7 @@ use anyhow::anyhow;
 use chrono::{DateTime, Utc};
 use serde::Deserialize;
 use sqlx::sqlite::SqliteConnectOptions;
-use sqlx::{ConnectOptions, Connection, FromRow, Sqlite, SqliteConnection, Transaction};
+use sqlx::{ConnectOptions, Connection, Execute, FromRow, Sqlite, SqliteConnection, Transaction};
 use tokio::sync::Mutex;
 
 use crate::prelude::*;
@@ -56,6 +56,15 @@ impl Storage {
         Ok(res)
     }
 
+    #[tracing::instrument(skip(self), name = "Storage::check_user_existance")]
+    pub async fn check_user_existance(&self, username: &str) -> Result<bool> {
+        let mut executor = self.conn.lock().await;
+        let result: Option<(String,)>  =
+            sqlx::query_as("select name from users where name = ?;").bind(username).fetch_optional(&mut *executor).await?;
+
+        Ok(result.is_some())
+    }
+
     #[tracing::instrument(skip(self), name = "Storage::retrieve_room_by_name")]
     pub async fn retrieve_room_by_name(&self, name: &str) -> Result<Option<StoredRoom>> {
         let mut executor = self.conn.lock().await;
diff --git a/crates/projection-irc/src/commands/mod.rs b/crates/projection-irc/src/commands/mod.rs
deleted file mode 100644
index 95e32b3..0000000
--- a/crates/projection-irc/src/commands/mod.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-use lavina_core::{prelude::Str, repo::Storage};
-use std::future::Future;
-use tokio::io::AsyncWrite;
-
-pub mod whois;
-
-pub struct HandlerArgs<T: AsyncWrite + Unpin> {
-    server_name: Str,
-    client: Str,
-    writer: T,
-    storage: Storage,
-}
-
-impl<T> HandlerArgs<T>
-where
-    T: AsyncWrite + Unpin,
-{
-    pub fn new(server_name: Str, client: Str, writer: T, storage: Storage) -> HandlerArgs<T> {
-        HandlerArgs {
-            server_name,
-            client,
-            writer,
-            storage,
-        }
-    }
-}
-
-pub trait Handler<T>
-where
-    T: AsyncWrite + Unpin,
-{
-    fn handle(&self, arg: HandlerArgs<T>) -> impl Future<Output = anyhow::Result<()>>;
-}
diff --git a/crates/projection-irc/src/commands/whois/mod.rs b/crates/projection-irc/src/commands/whois/mod.rs
deleted file mode 100644
index ee9fe6c..0000000
--- a/crates/projection-irc/src/commands/whois/mod.rs
+++ /dev/null
@@ -1,70 +0,0 @@
-use tokio::io::AsyncWrite;
-
-use lavina_core::prelude::Str;
-use proto_irc::client::command_args::Whois;
-use proto_irc::response::{IrcResponseMessage, WriteResponse};
-
-use crate::commands::whois::error::{ErrNoNicknameGiven431, ErrNoSuchNick401};
-use crate::commands::whois::response::{RplEndOfWhois318, RplWhoIsUser311};
-use crate::commands::Handler;
-
-use super::HandlerArgs;
-
-pub mod error;
-pub mod response;
-
-impl<T: AsyncWrite + Unpin> Handler<T> for Whois {
-    async fn handle(&self, body: HandlerArgs<T>) -> anyhow::Result<()> {
-        match self {
-            Whois::Nick(nick) => handle_nick_target(nick.clone(), body).await?,
-            Whois::TargetNick(_, nick) => handle_nick_target(nick.clone(), body).await?,
-            Whois::EmptyArgs => {
-                let HandlerArgs {
-                    server_name,
-                    mut writer,
-                    ..
-                } = body;
-                IrcResponseMessage::empty_tags(
-                    Some(server_name.clone()),
-                    ErrNoNicknameGiven431::new(server_name.clone()),
-                )
-                .write_response(&mut writer)
-                .await?
-            }
-        }
-        Ok(())
-    }
-}
-
-async fn handle_nick_target(nick: Str, body: HandlerArgs<impl AsyncWrite + Unpin>) -> anyhow::Result<()> {
-    let HandlerArgs {
-        server_name,
-        mut writer,
-        client,
-        mut storage,
-    } = body;
-    if let Some(user) = storage.retrieve_user_by_name(nick.clone().as_ref()).await? {
-        IrcResponseMessage::empty_tags(
-            Some(server_name.clone()),
-            RplWhoIsUser311::new(
-                client.clone(),
-                nick.clone(),
-                Some(Str::from(user.name.clone())),
-                server_name.clone(),
-                nick.clone(),
-            ),
-        )
-        .write_response(&mut writer)
-        .await?;
-
-        IrcResponseMessage::empty_tags(
-            Some(server_name.clone()),
-            RplEndOfWhois318::new(client.clone(), user.name.clone().into()),
-        )
-        .write_response(&mut writer)
-        .await?
-    } else {
-        ErrNoSuchNick401::new(client.clone(), nick.clone()).write_response(&mut writer).await?
-    }
-    Ok(())
-}
diff --git a/crates/projection-irc/src/handler.rs b/crates/projection-irc/src/handler.rs
new file mode 100644
index 0000000..2e7e0da
--- /dev/null
+++ b/crates/projection-irc/src/handler.rs
@@ -0,0 +1,18 @@
+use lavina_core::{player::PlayerConnection, prelude::Str, LavinaCore};
+use std::future::Future;
+use tokio::io::AsyncWrite;
+
+pub struct IrcConnection<'a, T: AsyncWrite + Unpin> {
+    pub server_name: Str,
+    /// client is nick of requester
+    pub client: Str,
+    pub writer: &'a mut T,
+    pub player_connection: &'a mut PlayerConnection,
+}
+
+pub trait Handler<T>
+where
+    T: AsyncWrite + Unpin,
+{
+    fn handle(&self, arg: IrcConnection<T>) -> impl Future<Output = anyhow::Result<()>>;
+}
diff --git a/crates/projection-irc/src/lib.rs b/crates/projection-irc/src/lib.rs
index bbaa717..7a2ec63 100644
--- a/crates/projection-irc/src/lib.rs
+++ b/crates/projection-irc/src/lib.rs
@@ -29,11 +29,12 @@ use proto_irc::user::PrefixedNick;
 use proto_irc::{Chan, Recipient, Tag};
 use sasl::AuthBody;
 mod cap;
-mod commands;
+use handler::Handler;
+mod whois;
 
 use crate::cap::Capabilities;
-use commands::Handler;
-use proto_irc::response::IrcResponseMessage;
+
+mod handler;
 
 pub const APP_VERSION: &str = concat!("lavina", "_", env!("CARGO_PKG_VERSION"));
 
@@ -80,7 +81,7 @@ async fn handle_socket(
             match registered_user {
                 Ok(user) => {
                     log::debug!("User registered");
-                    handle_registered_socket(config, core.players, core.rooms, &mut reader, &mut writer, user).await?;
+                    handle_registered_socket(config, core.players, core.rooms, &mut reader, &mut writer, user, &mut storage).await?;
                 }
                 Err(err) => {
                     log::debug!("Registration failed: {err}");
@@ -811,13 +812,15 @@ async fn handle_incoming_message(
                 }
             },
             ClientMessage::Whois { arg } => {
-                arg.handle(commands::HandlerArgs::new(
-                    config.server_name.clone(),
-                    user.nickname.clone(),
+                arg.handle(handler::IrcConnection {
+                    server_name: config.server_name.clone(),
+                    client: user.nickname.clone(),
                     writer,
-                    storage.clone(),
-                ))
-                .await?
+                    player_connection: user_handle,
+                })
+                .await?;
+
+                writer.flush().await?;
             }
             ClientMessage::Mode { target } => {
                 match target {
diff --git a/crates/projection-irc/src/whois.rs b/crates/projection-irc/src/whois.rs
new file mode 100644
index 0000000..ae741ab
--- /dev/null
+++ b/crates/projection-irc/src/whois.rs
@@ -0,0 +1,67 @@
+use lavina_core::{
+    player::{GetInfoResult, PlayerId},
+    prelude::Str,
+};
+use proto_irc::{
+    client::command_args::Whois,
+    commands::whois::{
+        error::{ErrNoNicknameGiven431, ErrNoSuchNick401},
+        response::RplEndOfWhois318,
+    },
+    response::{IrcResponseMessage, WriteResponse},
+};
+use tokio::io::AsyncWrite;
+
+use crate::handler::{Handler, IrcConnection};
+
+impl<T: AsyncWrite + Unpin> Handler<T> for Whois {
+    async fn handle(&self, body: IrcConnection<'_, T>) -> anyhow::Result<()> {
+        match self {
+            Whois::Nick(nick) => handle_nick_target(nick.clone(), body).await?,
+            Whois::TargetNick(_, nick) => handle_nick_target(nick.clone(), body).await?,
+            Whois::EmptyArgs => {
+                let IrcConnection {
+                    server_name,
+                    mut writer,
+                    ..
+                } = body;
+                IrcResponseMessage::empty_tags(
+                    Some(server_name.clone()),
+                    ErrNoNicknameGiven431::new(server_name.clone()),
+                )
+                .write_response(&mut writer)
+                .await?
+            }
+        }
+        Ok(())
+    }
+}
+
+async fn handle_nick_target(nick: Str, body: IrcConnection<'_, impl AsyncWrite + Unpin>) -> anyhow::Result<()> {
+    let IrcConnection {
+        server_name,
+        mut writer,
+        client,
+        player_connection,
+    } = body;
+
+    if let GetInfoResult::UserDoesntExist =
+        player_connection.check_user_existance(PlayerId::from(nick.clone())?).await?
+    {
+        IrcResponseMessage::empty_tags(
+            Some(server_name.clone()),
+            ErrNoSuchNick401::new(client.clone(), nick.clone()),
+        )
+        .write_response(&mut writer)
+        .await?
+    }
+
+    IrcResponseMessage::empty_tags(
+        Some(server_name.clone()),
+        RplEndOfWhois318::new(client.clone(), nick.clone()),
+    )
+    .write_response(&mut writer)
+    .await?;
+
+    Ok(())
+}
diff --git a/crates/projection-irc/tests/lib.rs b/crates/projection-irc/tests/lib.rs
index 2b069ef..96a679d 100644
--- a/crates/projection-irc/tests/lib.rs
+++ b/crates/projection-irc/tests/lib.rs
@@ -382,8 +382,16 @@ async fn scenario_two_users() -> Result<()> {
     s1.expect(":tester1 PART #test").await?;
     // The second user should receive the PART message
     s2.expect(":tester1 PART #test").await?;
+    
+    s1.send("WHOIS tester2").await?;
+    s1.expect(":testserver 318 tester1 tester2 :End of /WHOIS list").await?;
 
     stream1.shutdown().await?;
+    s2.send("WHOIS tester3").await?;
+    s2.expect(":testserver 401 tester2 tester3 :No such nick/channel").await?;
+    s2.expect(":testserver 318 tester2 tester3 :End of /WHOIS list").await?;
+
+
     stream2.shutdown().await?;
 
     server.shutdown().await?;
diff --git a/crates/proto-irc/src/commands/mod.rs b/crates/proto-irc/src/commands/mod.rs
new file mode 100644
index 0000000..80525f8
--- /dev/null
+++ b/crates/proto-irc/src/commands/mod.rs
@@ -0,0 +1 @@
+pub mod whois;
diff --git a/crates/projection-irc/src/commands/whois/error.rs b/crates/proto-irc/src/commands/whois/error.rs
similarity index 81%
rename from crates/projection-irc/src/commands/whois/error.rs
rename to crates/proto-irc/src/commands/whois/error.rs
index b7f5053..ea39d29 100644
--- a/crates/projection-irc/src/commands/whois/error.rs
+++ b/crates/proto-irc/src/commands/whois/error.rs
@@ -1,7 +1,7 @@
 use tokio::io::{AsyncWrite, AsyncWriteExt};
 
-use lavina_core::prelude::Str;
-use proto_irc::response::WriteResponse;
+use crate::{prelude::Str, response::WriteResponse};
+
 
 ///  ErrNoSuchNick401  
 pub struct ErrNoSuchNick401 {
@@ -34,7 +34,7 @@ impl ErrNoNicknameGiven431 {
 }
 
 impl WriteResponse for ErrNoSuchNick401 {
-    async fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
+    async fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
         writer.write_all(b"401 ").await?;
         writer.write_all(self.client.as_bytes()).await?;
         writer.write_all(b" ").await?;
@@ -46,7 +46,7 @@ impl WriteResponse for ErrNoSuchNick401 {
 }
 
 impl WriteResponse for ErrNoNicknameGiven431 {
-    async fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
+    async fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
         writer.write_all(b"431").await?;
         writer.write_all(self.client.as_bytes()).await?;
         writer.write_all(b" :").await?;
@@ -56,7 +56,7 @@ impl WriteResponse for ErrNoNicknameGiven431 {
 }
 
 impl WriteResponse for ErrNoSuchServer402 {
-    async fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
+    async fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
         writer.write_all(b"402 ").await?;
         writer.write_all(self.client.as_bytes()).await?;
         writer.write_all(b" ").await?;
diff --git a/crates/proto-irc/src/commands/whois/mod.rs b/crates/proto-irc/src/commands/whois/mod.rs
new file mode 100644
index 0000000..0170780
--- /dev/null
+++ b/crates/proto-irc/src/commands/whois/mod.rs
@@ -0,0 +1,2 @@
+pub mod error;
+pub mod response;
\ No newline at end of file
diff --git a/crates/projection-irc/src/commands/whois/response.rs b/crates/proto-irc/src/commands/whois/response.rs
similarity index 93%
rename from crates/projection-irc/src/commands/whois/response.rs
rename to crates/proto-irc/src/commands/whois/response.rs
index b707a49..9f3443b 100644
--- a/crates/projection-irc/src/commands/whois/response.rs
+++ b/crates/proto-irc/src/commands/whois/response.rs
@@ -2,8 +2,7 @@ use std::{net::IpAddr, time::SystemTime};
 
 use tokio::io::{AsyncWrite, AsyncWriteExt};
 
-use lavina_core::prelude::Str;
-use proto_irc::{response::WriteResponse, Chan};
+use crate::{prelude::Str, response::WriteResponse, Chan};
 
 /// "<client> <nick> :has client certificate fingerprint <fingerprint>"
 /// Clients MUST only be sent this numeric if they are either using the WHOIS command on themselves
@@ -150,12 +149,12 @@ impl RplEndOfWhois318 {
 }
 
 impl WriteResponse for RplWhoIsUser311 {
-    async fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
+    async fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
         writer.write_all(b"311 ").await?;
         writer.write_all(self.client.as_bytes()).await?;
         writer.write_all(b" ").await?;
         writer.write_all(self.nick.as_bytes()).await?;
-        if let Some(username) = self.username {
+        if let Some(username) = &self.username {
             writer.write_all(b" ").await?;
             writer.write_all(username.as_bytes()).await?;
         }
@@ -173,7 +172,7 @@ impl WriteResponse for RplWhoIsUser311 {
 }
 
 impl WriteResponse for RplEndOfWhois318 {
-    async fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
+    async fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
         writer.write_all(b"318 ").await?;
         writer.write_all(self.client.as_bytes()).await?;
         writer.write_all(b" ").await?;
diff --git a/crates/proto-irc/src/lib.rs b/crates/proto-irc/src/lib.rs
index 2d89e61..46de52b 100644
--- a/crates/proto-irc/src/lib.rs
+++ b/crates/proto-irc/src/lib.rs
@@ -6,6 +6,7 @@ pub mod server;
 #[cfg(test)]
 mod testkit;
 pub mod user;
+pub mod commands;
 
 use crate::prelude::Str;
 
diff --git a/crates/proto-irc/src/response.rs b/crates/proto-irc/src/response.rs
index 227f17c..8c2ac4f 100644
--- a/crates/proto-irc/src/response.rs
+++ b/crates/proto-irc/src/response.rs
@@ -6,7 +6,7 @@ use crate::prelude::Str;
 use crate::Tag;
 
 pub trait WriteResponse {
-    fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> impl Future<Output = std::io::Result<()>>;
+    fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> impl Future<Output = std::io::Result<()>>;
 }
 
 /// Server-to-client enum agnostic message
@@ -34,7 +34,7 @@ impl<T> IrcResponseMessage<T> {
 }
 
 impl<T: WriteResponse> WriteResponse for IrcResponseMessage<T> {
-    async fn write_response(self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
+    async fn write_response(&self, writer: &mut (impl AsyncWrite + Unpin)) -> std::io::Result<()> {
         if let Some(sender) = &self.sender {
             writer.write_all(b":").await?;
             writer.write_all(sender.as_bytes()).await?;