Port 21000- Port 21100
Port 21100- Port 21200
Port 21200- Port 21300
Port 21300- Port 21400
Port 21400- Port 21500
Port 21500- Port 21600
Port 21600- Port 21700
Port 21700- Port 21800
Port 21800- Port 21900
Port 21900- Port 22000
Port 21100- Port 21200
Port 21200- Port 21300
Port 21300- Port 21400
Port 21400- Port 21500
Port 21500- Port 21600
Port 21600- Port 21700
Port 21700- Port 21800
Port 21800- Port 21900
Port 21900- Port 22000
| Port | Protocol (TCP/UDP) | Title | Description |
| Port 21000 | tcp | irtrans | IRTrans Control |
| Port 21000 | udp | irtrans | IRTrans Control |
| Port 21554 | tcp | dfserver | MineScape Design File |
| Port 21554 | udp | dfserver | MineScape Design File |
| Port 21590 | tcp | vofr-gateway | VoFR Gateway |
| Port 21590 | udp | vofr-gateway | VoFR Gateway |
| Port 21800 | tcp | tvpm | TVNC Pro Multiplexing |
| Port 21800 | udp | tvpm | TVNC Pro Multiplexing |
| Port 21845 | tcp | webphone | webphone |
| Port 21845 | udp | webphone | webphone |
| Port 21846 | tcp | netspeak-is | NetSpeak Corp. Directory |
| Port 21846 | udp | netspeak-is | NetSpeak Corp. Directory |
| Port 21847 | tcp | netspeak-cs | NetSpeak Corp. Connection |
| Port 21847 | udp | netspeak-cs | NetSpeak Corp. Connection |
| Port 21848 | tcp | netspeak-acd | NetSpeak Corp. Automatic Distribution |
| Port 21848 | udp | netspeak-acd | NetSpeak Corp. Automatic Distribution |
| Port 21849 | tcp | netspeak-cps | NetSpeak Corp. Credit System |
| Port 21849 | udp | netspeak-cps | NetSpeak Corp. Credit System |
| Port 22000 | tcp | snapenetio | SNAPenetIO |
| Port 22000 | udp | snapenetio | SNAPenetIO |