diff --git a/cavemen/nixrunserver.sh b/cavemen/nixrunserver.sh
index 8ba90ee..d706dfd 100755
--- a/cavemen/nixrunserver.sh
+++ b/cavemen/nixrunserver.sh
@@ -1,23 +1,61 @@
 #!/usr/bin/env nix-shell
 #! nix-shell -i bash --pure
 #! nix-shell -p javaPackages.compiler.openjdk17
+#! nix-shell -p miniupnpc
 #! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/tarball/nixos-25.11
 
+PACK_AFTER=0
+UPNP=0
+for arg in "$@"; do
+    [[ "$arg" == "--pack-after" ]] && PACK_AFTER=1
+    [[ "$arg" == "--upnp" ]]       && UPNP=1
+done
+
 source /home/h3lp/mineserver/minecraft.env
 
+if [[ "$UPNP" == 1 ]]; then
+    SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+    PROPERTIES="$SCRIPT_DIR/server.properties"
+    if [[ -f "$PROPERTIES" ]]; then
+        PORT=$(grep -oP '(?<=^server-port=)\d+' "$PROPERTIES")
+    fi
+    PORT="${PORT:-25565}"
+    LOCAL_IP="$(upnpc -s 2>/dev/null | grep -oP '(?<=Local LAN ip address : ).*')"
+
+    echo "Opening port $PORT/TCP via UPnP..."
+    upnpc -a "$LOCAL_IP" "$PORT" "$PORT" TCP
+    TCP_OK=$?
+    echo "Opening port $PORT/UDP via UPnP..."
+    upnpc -a "$LOCAL_IP" "$PORT" "$PORT" UDP
+    UDP_OK=$?
+
+    if [[ $TCP_OK -ne 0 || $UDP_OK -ne 0 ]]; then
+        echo "Warning: One or more UPnP port mappings failed. The port may not be reachable from outside."
+    fi
+
+    cleanup() {
+        echo "Removing UPnP port mappings for $PORT..."
+        upnpc -d "$PORT" TCP
+        upnpc -d "$PORT" UDP
+    }
+    trap cleanup EXIT
+fi
+
 java -Xmx${MEMORY_MAX}M -Xms${MEMORY_MIN}M -jar minecraft_server.jar nogui
 
-read -rp "Pack and publish world? [y/N] " answer
-if [[ "$answer" =~ ^[Yy]$ ]]; then
-    set -e
-    WORLD=/home/h3lp/mineserver/world
-    OUTPUT=/var/www/hostedfiles/world.tar.xz
-    TMP=$(mktemp)
-    tar -cJf "$TMP" -C "$WORLD" .
-    mv "$TMP" "$OUTPUT"
-    chmod 644 "$OUTPUT"
-    echo "Done: $OUTPUT"
-    set +e
+if [[ "$PACK_AFTER" == 1 ]]; then
+    read -rp "Pack and publish world? [y/N] " answer
+    if [[ "$answer" =~ ^[Yy]$ ]]; then
+        set -e
+        WORLD=/home/h3lp/mineserver/world
+        OUTPUT=/var/www/hostedfiles/world.tar.xz
+        TMP=$(mktemp)
+        tar -cJf "$TMP" -C "$WORLD" .
+        mv "$TMP" "$OUTPUT"
+        chmod 644 "$OUTPUT"
+        echo "Done: $OUTPUT"
+        set +e
+    fi
 fi
 
 read -rp "Press Enter to continue..."