CyberHunter
Local dataset, no network
// Other services

Port 1905: Secure UP.Link Gateway Protocol

Port 1905 is assigned by IANA to sugp (Secure UP.Link Gateway Protocol).

1905

How sugp works

Other services
client:1905sugpresponse client:1905sugpresponse

The client sends a request to port 1905 and the sugp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1905 dangerous?

We have no specific security note for port 1905. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1905

ServicePortTransportDescriptionReferenceUpdated
sugp 1905 TCP, UDP Secure UP.Link Gateway Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1905, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1905'      # process listening on 1905
sudo lsof -nP -i :1905

macOS

sudo lsof -nP -i :1905

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1905 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1905
netstat -ano | findstr :1905

From another machine

nmap -p 1905 -sV <host>
sudo nmap -sU -p 1905 <host>
nc -zv <host> 1905

Block it in the firewall

sudo ufw deny 1905/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1905" -Direction Inbound -LocalPort 1905 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1905 used for?

Port 1905 is assigned by IANA to sugp (Secure UP.Link Gateway Protocol).

Is port 1905 TCP or UDP?

Port 1905 is registered for TCP and UDP.

Is it safe to open port 1905?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1905 is open?

On Linux run "ss -ltnup 'sport = :1905'", on macOS "lsof -nP -i :1905", and on Windows "netstat -ano | findstr :1905" to see the local process. From another machine, "nmap -p 1905 <host>" shows whether it is reachable.

05 Related
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