:638
(TCP/UDP)
Low Risk
MCNS-SEC
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 — Security & VPN
Port Overview
Port Number
638
Service Name
MCNS-SEC
Transport Protocol
TCP/UDP
Category
Security & VPN
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 638?
MCNS Security. Multimedia Cable Network System security protocol for cable network authentication.
TCP/UDP
Security & VPN
Security Considerations
Port 638 (MCNS-SEC) 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.