Well known UDP Port 1-1024
| Port Number | Protocol | Description |
| 7 | echo | echo |
| 53 | domain | Domain name protocol |
| 123 | ntp | Network time protocol |
| 137 | netbios | NetBIOS name server protocol |
| 138 | netbios | NetBIOS datagram |
| 139 | netbios | NetBIOS session |
| 161 | snmp | SNMP |
| 162 | snmp | SNMP trap |
