Windows networking ports
Overview
Exposing SMB or RPC to the internet invites ransomware and credential attacks. Keep these ports inside the LAN or VPN and disable SMBv1.
Ports in this category14
Range coveredAll registry ranges
All Windows networking port numbers
Every port below is assigned to this category in the registry or by a widely used convention. Open a port for its check and block commands, risk rating and troubleshooting notes.
| Port | Service | Transport | Risk | Description |
|---|---|---|---|---|
| 137 | NETBIOS-NS | TCP / UDP | High | NETBIOS Name Service |
| 138 | NETBIOS-DGM | TCP / UDP | High | NETBIOS Datagram Service |
| 139 | NETBIOS-SSN | TCP / UDP | High | NETBIOS Session Service |
| 445 | MICROSOFT-DS | TCP / UDP | High | Microsoft-DS |
| 1512 | WINS | TCP / UDP | Standard/Low | Microsoft's Windows Internet Name Service |
| 5009 | WINFS | TCP / UDP | Standard/Low | Microsoft Windows Filesystem |
| 5360 | MS-SIDESHOW | TCP / UDP | Standard/Low | Protocol for Windows SideShow |
| 5361 | MS-S-SIDESHOW | TCP / UDP | Standard/Low | Secure Protocol for Windows SideShow |
| 5362 | SERVERWSD2 | TCP / UDP | Standard/Low | Microsoft Windows Server WSD2 Service |
| 5363 | NET-PROJECTION | TCP / UDP | Standard/Low | Windows Network Projection |
| 5445 | SMBDIRECT | TCP / SCTP | Standard/Low | Server Message Block over Remote Direct Memory Access |
| 6602 | WSSCOMFRMWK | TCP | Standard/Low | Windows WSS Communication Framework |
| 31029 | YAWN | UDP | Standard/Low | YaWN - Yet Another Windows Notifier |
| 47001 | WINRM | TCP | Standard/Low | Windows Remote Management Service |
Other categories
Authentication and access 19Caching and in-memory stores 10Containers and orchestration 10DNS and naming 10Databases 54Development servers 13Directory services 14Email 26File transfer and sharing 27Gaming 6Infrastructure and administration 30IoT and device telemetry 7Message queues and streaming 17Monitoring and metrics 29Networking and proxies 31Printing 19RPC and service APIs 14Remote access 29Time synchronization 10VPN and tunnelling 10Voice and real-time media 29Web and HTTP 62
Primary data: IANA Service Name and Transport Protocol Port Number Registry, plus clearly marked community conventions.
Last reviewed 2026-10-30 · Methodology · About · Privacy