The MIDI Manufacturer's Association (MMA) assigns each manufacturer of MIDI products a unique ID which is used in conjunction with the model ID (assigned by the manufacturer) to identify which product is the intended receiver of their system exclusive messages. This way other products receiving the same messages can ignore them.
0x01 001 SequentialCircuits
0x02 002 Big Briar
0x03 003 Octave/Plateau
0x04 004 Moog
0x05 005 Passport Designs
0x06 006 Lexicon
0x07 007 Kurzweil
0x08 008 Fender
0x09 009 Gulbransen
0x0A 010 Delta Labs
0x0B 011 Sound Comp
0x0C 012 General Electro
0x0D 013 Matthews Research
0x0E 014 Effect control 2
0x10 016 Oberheim
0x11 017 PAIA
0x12 018 Simmons
0x13 019 DigiDesign
0x14 020 Fairlight
0x15 021 JL Cooper
0x16 022 Lowery
0x17 023 Lin
0x18 024 Emu
0x1B 027 Peavey
0x20 032 BonTempi
0x21 033 S.I.E.L.
0x23 035 SyntheAxe
0x24 036 Hohner
0x25 037 Crumar
0x26 038 Solton
0x27 039 Jellinghaus Ms
0x28 040 CTS
0x29 041 PPG
0x2F 047 Elka
0x36 054 Cheetah
0x3E 062 Waldorf
0x40 064 Kawai
0x41 065 Roland
0x42 066 Korg
0x43 067 Yamaha
0x44 068 Casio
0x46 070 Kamiya Studio
0x47 071 Akai
0x48 072 Victor
0x4B 075 Fujitsu
0x4C 076 Sony
0x4E 078 Teac
0x50 080 Matsushita
0x51 081 Fostex
0x52 082 Zoom
0x54 084 Matsushita
0x55 085 Suzuki
0x56 086 Fuji Sound
0x57 087 Acoustic Technical Laboratory
0x7E 126 Universal Non Realtime Message (UNRT)
0x7F 127 Universal Realtime Message (URT)