This subject comes up a lot so this post describes how to connect a USB MIDI keyboard to MIDI hardware including sound modules, drum machines, etc.
Professional Handheld MIDI Controller - Eastern Voltage Research
MOTOR SYNTH MKII - Gamechanger Audio
Electric Piano Drum Usb In out Midi Interface - Temu
ZVFOTN Upgrade Professional MIDI to USB Interface MIDI CableInput&Output Adapter Connecting with Keyboard/Synthesizer for Editing&Recording Track Work with Windows/Mac OS for Studio - 6.5Ft : Musical Instruments
M-WAVE 25 Key USB MIDI Keyboard Controller With 8 Backlit Drum Pads, Bluetooth Semi Weighted Professional dynamic keybed 8 Knobs and Music Production,Software Included (Pink) : Musical Instruments
M-Audio Oxygen Pro 25 Performance 25-Key USB MIDI Keyboard Controller oxygen-pro-25 - Canada's Favourite Music Store - Acclaim Sound and Lighting
Novation FLKEY-MINI Ultimate Compact 25 Key MIDI Keyboard Controller for Use with FL Studio fl-key-mini - Canada's Favourite Music Store - Acclaim Sound and Lighting
Novation FLKEY-49 Ultimate Full Sized 49 Key MIDI Keyboard Controller for Use with FL Studio - Canada's Favourite Music Store - Acclaim Sound and Lighting
USB B MIDI Cable for Instruments 3 FT, Ancable USB A to USB B cable Co
rtpMIDI Adventures - Plasma Music Limited
M-Audio Oxygen 61 MK V 61 Key USB MIDI Controller with Smart Controls and Auto-Mapping oxygen-61-mk-v - Canada's Favourite Music Store - Acclaim Sound and Lighting