diff --git a/protocol/src/main/kotlin/org/openrs2/protocol/Protocol.kt b/protocol/src/main/kotlin/org/openrs2/protocol/Protocol.kt
index cd7c13ff70..d3e7980822 100644
--- a/protocol/src/main/kotlin/org/openrs2/protocol/Protocol.kt
+++ b/protocol/src/main/kotlin/org/openrs2/protocol/Protocol.kt
@@ -5,6 +5,7 @@ import org.openrs2.protocol.login.InitJaggrabConnectionCodec
 import org.openrs2.protocol.login.InitJs5RemoteConnectionCodec
 import org.openrs2.protocol.login.IpLimitCodec
 import org.openrs2.protocol.login.Js5OkCodec
+import org.openrs2.protocol.login.RequestWorldListCodec
 import org.openrs2.protocol.login.ServerFullCodec
 
 public class Protocol(vararg codecs: PacketCodec<*>) {
@@ -30,7 +31,8 @@ public class Protocol(vararg codecs: PacketCodec<*>) {
     public companion object {
         public val LOGIN_UPSTREAM: Protocol = Protocol(
             InitJs5RemoteConnectionCodec,
-            InitJaggrabConnectionCodec
+            InitJaggrabConnectionCodec,
+            RequestWorldListCodec
         )
         public val LOGIN_DOWNSTREAM: Protocol = Protocol(
             Js5OkCodec,
diff --git a/protocol/src/main/kotlin/org/openrs2/protocol/login/LoginRequest.kt b/protocol/src/main/kotlin/org/openrs2/protocol/login/LoginRequest.kt
index 5e4ca46d0b..490fb66f2a 100644
--- a/protocol/src/main/kotlin/org/openrs2/protocol/login/LoginRequest.kt
+++ b/protocol/src/main/kotlin/org/openrs2/protocol/login/LoginRequest.kt
@@ -5,4 +5,5 @@ import org.openrs2.protocol.Packet
 public sealed class LoginRequest : Packet {
     public data class InitJs5RemoteConnection(public val build: Int) : LoginRequest()
     public object InitJaggrabConnection : LoginRequest()
+    public data class RequestWorldList(public val checksum: Int) : LoginRequest()
 }
diff --git a/protocol/src/main/kotlin/org/openrs2/protocol/login/RequestWorldListCodec.kt b/protocol/src/main/kotlin/org/openrs2/protocol/login/RequestWorldListCodec.kt
new file mode 100644
index 0000000000..fb0392e542
--- /dev/null
+++ b/protocol/src/main/kotlin/org/openrs2/protocol/login/RequestWorldListCodec.kt
@@ -0,0 +1,19 @@
+package org.openrs2.protocol.login
+
+import io.netty.buffer.ByteBuf
+import org.openrs2.protocol.PacketCodec
+
+public object RequestWorldListCodec : PacketCodec<LoginRequest.RequestWorldList>(
+    type = LoginRequest.RequestWorldList::class.java,
+    opcode = 23,
+    length = 4
+) {
+    override fun decode(input: ByteBuf): LoginRequest.RequestWorldList {
+        val checksum = input.readInt()
+        return LoginRequest.RequestWorldList(checksum)
+    }
+
+    override fun encode(input: LoginRequest.RequestWorldList, output: ByteBuf) {
+        output.writeInt(input.checksum)
+    }
+}