:138
(UDP)
High Risk
NetBIOS Datagram
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://ipfyi.com/iframe/entity//" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://ipfyi.com/entity//Add a dynamic SVG badge to your README or docs.
[](https://ipfyi.com/entity//)Use the native HTML custom element.
UDP — System & Infrastructure
Port Overview
Port Number
138
Service Name
NetBIOS Datagram
Transport Protocol
UDP
Category
System & Infrastructure
Security Risk
High
Port Range
Well-Known (0-1023)
What is Port 138?
NetBIOS Datagram Service. Provides connectionless messaging between NetBIOS hosts for browsing, announcements, and other lightweight network operations.
UDP
System & Infrastructure
Commonly Used
Security Considerations
Port 138 (NetBIOS Datagram) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.