diff --git a/keyboards/ymdk/np24/u4rgb6/config.h b/keyboards/ymdk/np24/u4rgb6/config.h
new file mode 100644
index 0000000000..dc86ae344b
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/config.h
@@ -0,0 +1,55 @@
+/* Copyright 2021 Simon Arlott
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0x594D
+#define PRODUCT_ID      0x5024
+#define DEVICE_VER      0x0406
+#define MANUFACTURER    YMDK
+#define PRODUCT         NP24 U4 RGB6
+
+/* key matrix size */
+#define MATRIX_ROWS 6
+#define MATRIX_COLS 4
+
+/* key matrix pins */
+#define MATRIX_ROW_PINS { B3, B6, B2, B1, D7, B4 }
+#define MATRIX_COL_PINS { F5, F4, D3, D2 }
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION ROW2COL
+
+/* LED indicator pins */
+#define LED_NUM_LOCK_PIN    C6
+#define LED_PIN_ON_STATE    0
+
+/* number of backlight levels */
+#define BACKLIGHT_PIN B7
+#ifdef BACKLIGHT_PIN
+# define BACKLIGHT_LEVELS 31
+#endif
+
+/* Set 0 if debouncing isn't needed */
+#define DEBOUNCE 5
+
+#define RGB_DI_PIN E2
+#ifdef RGB_DI_PIN
+# define RGBLED_NUM 6
+# define RGBLIGHT_ANIMATIONS
+#endif
diff --git a/keyboards/ymdk/np24/u4rgb6/info.json b/keyboards/ymdk/np24/u4rgb6/info.json
new file mode 100644
index 0000000000..313eeabff7
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/info.json
@@ -0,0 +1,102 @@
+{
+    "keyboard_name": "YMDK NP24 U4 RGB6",
+    "maintainer": "qmk",
+    "width": 4,
+    "height": 6.25,
+    "layouts": {
+        "LAYOUT_ortho_6x4": {
+            "layout": [
+                {"x": 0, "y": 0},
+                {"x": 1, "y": 0},
+                {"x": 2, "y": 0},
+                {"x": 3, "y": 0},
+
+                {"x": 0, "y": 1.25},
+                {"x": 1, "y": 1.25},
+                {"x": 2, "y": 1.25},
+                {"x": 3, "y": 1.25},
+
+                {"x": 0, "y": 2.25},
+                {"x": 1, "y": 2.25},
+                {"x": 2, "y": 2.25},
+                {"x": 3, "y": 2.25},
+
+                {"x": 0, "y": 3.25},
+                {"x": 1, "y": 3.25},
+                {"x": 2, "y": 3.25},
+                {"x": 3, "y": 3.25},
+
+                {"x": 0, "y": 4.25},
+                {"x": 1, "y": 4.25},
+                {"x": 2, "y": 4.25},
+                {"x": 3, "y": 4.25},
+
+                {"x": 0, "y": 5.25},
+                {"x": 1, "y": 5.25},
+                {"x": 2, "y": 5.25},
+                {"x": 3, "y": 5.25}
+            ]
+        },
+        "LAYOUT_ortho_4x6": {
+            "layout": [
+                {"x": 0, "y": 0},
+                {"x": 1, "y": 0},
+                {"x": 2, "y": 0},
+                {"x": 3, "y": 0},
+                {"x": 4, "y": 0},
+                {"x": 5.25, "y": 0},
+
+                {"x": 0, "y": 1},
+                {"x": 1, "y": 1},
+                {"x": 2, "y": 1},
+                {"x": 3, "y": 1},
+                {"x": 4, "y": 1},
+                {"x": 5.25, "y": 1},
+
+                {"x": 0, "y": 2},
+                {"x": 1, "y": 2},
+                {"x": 2, "y": 2},
+                {"x": 3, "y": 2},
+                {"x": 4, "y": 2},
+                {"x": 5.25, "y": 2},
+
+                {"x": 0, "y": 3},
+                {"x": 1, "y": 3},
+                {"x": 2, "y": 3},
+                {"x": 3, "y": 3},
+                {"x": 4, "y": 3},
+                {"x": 5.25, "y": 3}
+            ]
+        },
+        "LAYOUT_numpad_6x4": {
+            "layout": [
+                {"x": 0, "y": 0},
+                {"x": 1, "y": 0},
+                {"x": 2, "y": 0},
+                {"x": 3, "y": 0},
+
+                {"x": 0, "y": 1.25},
+                {"x": 1, "y": 1.25},
+                {"x": 2, "y": 1.25},
+                {"x": 3, "y": 1.25},
+
+                {"x": 0, "y": 2.25},
+                {"x": 1, "y": 2.25},
+                {"x": 2, "y": 2.25},
+
+                {"x": 0, "y": 3.25},
+                {"x": 1, "y": 3.25},
+                {"x": 2, "y": 3.25},
+                {"x": 3, "y": 2.25, "h": 2},
+
+                {"x": 0, "y": 4.25},
+                {"x": 1, "y": 4.25},
+                {"x": 2, "y": 4.25},
+
+                {"x": 0, "y": 5.25, "w": 2},
+                {"x": 2, "y": 5.25},
+                {"x": 3, "y": 4.25, "h": 2}
+            ]
+        }
+    }
+}
diff --git a/keyboards/ymdk/np24/u4rgb6/keymaps/default/keymap.c b/keyboards/ymdk/np24/u4rgb6/keymaps/default/keymap.c
new file mode 100644
index 0000000000..48ec3599d7
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/keymaps/default/keymap.c
@@ -0,0 +1,49 @@
+/* Copyright 2021 Simon Arlott
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+enum layer_names {
+    L_NUM,
+    L_BL,
+    L_RGB
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [L_NUM] = LAYOUT_ortho_6x4(
+        KC_ESC,  KC_CALC, MO(L_BL),MO(L_RGB),
+        KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
+        KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
+        KC_P4,   KC_P5,   KC_P6,   KC_PPLS,
+        KC_P1,   KC_P2,   KC_P3,   KC_PENT,
+        KC_P0,   KC_P0,   KC_PDOT, KC_PENT
+    ),
+    [L_BL] = LAYOUT_ortho_6x4(
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, BL_ON,   _______, BL_INC,
+        _______, BL_TOGG, _______, BL_INC,
+        _______, BL_OFF,  _______, BL_DEC,
+        BL_BRTG, _______, _______, BL_DEC
+    ),
+    [L_RGB] = LAYOUT_ortho_6x4(
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, RGB_MOD, _______, RGB_VAI,
+        _______, RGB_TOG, _______, RGB_VAI,
+        _______, RGB_RMOD,_______, RGB_VAD,
+        RGB_M_R, _______, _______, RGB_VAD
+    )
+};
diff --git a/keyboards/ymdk/np24/u4rgb6/keymaps/default/readme.md b/keyboards/ymdk/np24/u4rgb6/keymaps/default/readme.md
new file mode 100644
index 0000000000..7bcf47f3a9
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/keymaps/default/readme.md
@@ -0,0 +1,29 @@
+# The default keymap for the YMDK NP24 keypad
+
+Not the manufacturer default, which has F1, F2, F3, Fn on the top row.
+The function layer for the top row was: RGB_MOD, BL_STEP, ______, ______.
+
+```
+Base Layer                               Function Layer 1                         Function Layer 2
+             .-----.                                  .-----.                                  .-----.
+             | USB |                                  | USB |                                  | USB |
+,-------------------------------.        ,-------------------------------.        ,-------------------------------.
+| Esc   | Calc  | Fn 1  | Fn 2  |        |       |       |▒▒▒▒▒▒▒|       |        |       |       |       |▒▒▒▒▒▒▒|
+|       |       |       |       |        |       |       |▒▒▒▒▒▒▒|       |        |       |       |       |▒▒▒▒▒▒▒|
+|-------+-------+-------+-------|        |-------+-------+-------+-------|        |-------+-------+-------+-------|
+| Num   | /     | *     | -     |        |       |       |       |       |        |       |       |       |       |
+| Lock  |       |       |       |        |       |       |       |       |        |       |       |       |       |
+|-------+-------+-------+-------|        |-------+-------+-------+-------|        |-------+-------+-------+-------|
+| 7     | 8     | 9     | +     |        |       | BL    |       | BL    |        |       |Mode   |       |Bright |
+| Home  | Up    | PgUp  |       |        |       | On    |       | Inc   |        |       |Forward|       |Inc    |
+|-------+-------+-------+-------|        |-------+-------+-------+-------|        |-------+-------+-------+-------|
+| 4     | 5     | 6     | +     |        |       | BL    |       | BL    |        |       |Toggle |       |Bright |
+| Left  |       | Right |       |        |       | Togg  |       | Inc   |        |       |On/Off |       |Inc    |
+|-------+-------+-------+-------|        |-------+-------+-------+-------|        |-------+-------+-------+-------|
+| 1     | 2     | 3     | Ent   |        |       | BL    |       | BL    |        |       |Mode   |       |Bright |
+| End   | Down  | PgDn  |       |        |       | Off   |       | Dec   |        |       |Back   |       |Dec    |
+|-------+-------+-------+-------|        |-------+-------+-------+-------|        |-------+-------+-------+-------|
+| 0     | 0     | .     | Ent   |        | BL    |       |       | BL    |        |Mode   |       |       |Bright |
+| Ins   | Ins   | Del   |       |        | Breath|       |       | Dec   |        |Rainbow|       |       |Dec    |
+`-------------------------------'        `-------------------------------'        `-------------------------------'
+```
diff --git a/keyboards/ymdk/np24/u4rgb6/readme.md b/keyboards/ymdk/np24/u4rgb6/readme.md
new file mode 100644
index 0000000000..53e74f2de6
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/readme.md
@@ -0,0 +1,18 @@
+# YMDK NP24 U4 RGB6
+
+24 key number-pad with 6 RGB LEDs on the bottom (black PCB) sold by YMDK on Aliexpress (https://ymdk.aliexpress.com/store/429151).
+
+Not to be confused with the 8 RGB LED version (white PCB) that has an ATmega32A ("ymdk_np21").
+
+* Keyboard Maintainer: [QMK Community](https://github.com/qmk)
+* Hardware Supported: ATmega32U4
+
+Make example for this keyboard (after setting up your build environment):
+
+    make ymdk/np24/u4rgb6:default
+
+Flashing example for this keyboard:
+
+    make ymdk/np24/u4rgb6:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/ymdk/np24/u4rgb6/rules.mk b/keyboards/ymdk/np24/u4rgb6/rules.mk
new file mode 100644
index 0000000000..625a433f92
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/rules.mk
@@ -0,0 +1,24 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
+
+LAYOUTS = ortho_6x4 numpad_6x4 ortho_4x6
diff --git a/keyboards/ymdk/np24/u4rgb6/u4rgb6.c b/keyboards/ymdk/np24/u4rgb6/u4rgb6.c
new file mode 100644
index 0000000000..edd0c0552d
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/u4rgb6.c
@@ -0,0 +1,16 @@
+/* Copyright 2021 Simon Arlott
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "u4rgb6.h"
diff --git a/keyboards/ymdk/np24/u4rgb6/u4rgb6.h b/keyboards/ymdk/np24/u4rgb6/u4rgb6.h
new file mode 100644
index 0000000000..83ec486887
--- /dev/null
+++ b/keyboards/ymdk/np24/u4rgb6/u4rgb6.h
@@ -0,0 +1,67 @@
+/* Copyright 2017 Luiz Ribeiro <luizribeiro@gmail.com>
+ * Copyright 2021 Simon Arlott
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include "quantum.h"
+
+#define XXX KC_NO
+
+#define LAYOUT_ortho_6x4( \
+    k00,  k10,  k20,  k30, \
+    k01,  k11,  k21,  k31, \
+    k02,  k12,  k22,  k32, \
+    k03,  k13,  k23,  k33, \
+    k04,  k14,  k24,  k34, \
+    k05,  k15,  k25,  k35  \
+) { \
+    { k00, k10, k20, k30 }, \
+    { k01, k11, k21, k31 }, \
+    { k02, k12, k22, k32 }, \
+    { k03, k13, k23, k33 }, \
+    { k04, k14, k24, k34 }, \
+    { k05, k15, k25, k35 }  \
+}
+
+#define LAYOUT_ortho_4x6( \
+    k00, k01, k02, k03, k04, k05, \
+    k10, k11, k12, k13, k14, k15, \
+    k20, k21, k22, k23, k24, k25, \
+    k30, k31, k32, k33, k34, k35  \
+) { \
+    { k00, k10, k20, k30 }, \
+    { k01, k11, k21, k31 }, \
+    { k02, k12, k22, k32 }, \
+    { k03, k13, k23, k33 }, \
+    { k04, k14, k24, k34 }, \
+    { k05, k15, k25, k35 }  \
+}
+
+#define LAYOUT_numpad_6x4( \
+    k00, k10, k20, k30, \
+    k01, k11, k21, k31, \
+    k02, k12, k22,      \
+    k03, k13, k23, k33, \
+    k04, k14, k24,      \
+    k15,      k25, k35  \
+) { \
+    { k00, k10, k20, k30 }, \
+    { k01, k11, k21, k31 }, \
+    { k02, k12, k22, XXX }, \
+    { k03, k13, k23, k33 }, \
+    { k04, k14, k24, XXX }, \
+    { XXX, k15, k25, k35 }  \
+}