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// Other services

Port 1959: SIMP Channel

Port 1959 is assigned by IANA to simp-all (SIMP Channel).

1959

How simp-all works

Other services
client:1959simp-allresponse client:1959simp-allresponse

The client sends a request to port 1959 and the simp-all 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 1959 dangerous?

We have no specific security note for port 1959. 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 1959

ServicePortTransportDescriptionReferenceUpdated
simp-all 1959 TCP, UDP SIMP Channel - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1959, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1959'      # process listening on 1959
sudo lsof -nP -i :1959

macOS

sudo lsof -nP -i :1959

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1959 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1959
netstat -ano | findstr :1959

From another machine

nmap -p 1959 -sV <host>
sudo nmap -sU -p 1959 <host>
nc -zv <host> 1959

Block it in the firewall

sudo ufw deny 1959/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1959" -Direction Inbound -LocalPort 1959 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1959 used for?

Port 1959 is assigned by IANA to simp-all (SIMP Channel).

Is port 1959 TCP or UDP?

Port 1959 is registered for TCP and UDP.

Is it safe to open port 1959?

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 1959 is open?

On Linux run "ss -ltnup 'sport = :1959'", on macOS "lsof -nP -i :1959", and on Windows "netstat -ano | findstr :1959" to see the local process. From another machine, "nmap -p 1959 <host>" shows whether it is reachable.

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