Port 1900 — SSDP / UPnP
Quick reference for TCP/UDP port 1900, used by SSDP / UPnP. Includes what the service does, security guidance and related ports.
What is port 1900?
Simple Service Discovery — UPnP. Disable on the WAN.
What port does SSDP / UPnP use?
SSDP / UPnP listens on port 1900 by default.
Security guidance
High risk — do not expose to the internet
Port 1900 (SSDP / UPnP) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 1900 used for?+
Port 1900 is the standard TCP/UDP port for SSDP / UPnP. Simple Service Discovery — UPnP. Disable on the WAN.
What port does SSDP / UPnP use?+
SSDP / UPnP listens on port 1900 by default.
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