Port 1900: SSDP
Port 1900 is SSDP, the discovery protocol behind UPnP that lets devices like smart TVs, printers, and media servers announce themselves and find each other on the local network. It is not meant to be reachable from outside the LAN.
| Port number | 1900 |
|---|---|
| Service | Simple Service Discovery Protocol |
| Protocol | UDP |
| Category | Chat & messaging |
| Default encryption | No |
Frequently asked questions
What is port 1900 used for?
Port 1900 is SSDP, the discovery protocol behind UPnP that lets devices like smart TVs, printers, and media servers announce themselves and find each other on the local network. It is not meant to be reachable from outside the LAN.
Is port 1900 TCP or UDP?
Port 1900 (SSDP) uses UDP.
Is port 1900 secure?
Port 1900 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 1900 on my firewall?
Only if you specifically need SSDP. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.