:391
(TCP/UDP)
Low Risk
SynOptics-SNMP
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.
TCP/UDP — System & Infrastructure
Port Overview
Port Number
391
Service Name
SynOptics-SNMP
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 391?
SynOptics SNMP Relay. SNMP relay protocol for SynOptics (now Nortel/Extreme) network management.
TCP/UDP
System & Infrastructure
Security Considerations
Port 391 (SynOptics-SNMP) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.