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// Other services

Port 1961: BTS APPSERVER

Port 1961 is assigned by IANA to bts-appserver (BTS APPSERVER).

1961

How bts-appserver works

Other services
client:1961bts-appserverresponse client:1961bts-appserverresponse

The client sends a request to port 1961 and the bts-appserver 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 1961 dangerous?

We have no specific security note for port 1961. 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 1961

ServicePortTransportDescriptionReferenceUpdated
bts-appserver 1961 TCP, UDP BTS APPSERVER - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1961, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1961'      # process listening on 1961
sudo lsof -nP -i :1961

macOS

sudo lsof -nP -i :1961

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1961 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1961
netstat -ano | findstr :1961

From another machine

nmap -p 1961 -sV <host>
sudo nmap -sU -p 1961 <host>
nc -zv <host> 1961

Block it in the firewall

sudo ufw deny 1961/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1961" -Direction Inbound -LocalPort 1961 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1961 used for?

Port 1961 is assigned by IANA to bts-appserver (BTS APPSERVER).

Is port 1961 TCP or UDP?

Port 1961 is registered for TCP and UDP.

Is it safe to open port 1961?

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 1961 is open?

On Linux run "ss -ltnup 'sport = :1961'", on macOS "lsof -nP -i :1961", and on Windows "netstat -ano | findstr :1961" to see the local process. From another machine, "nmap -p 1961 <host>" shows whether it is reachable.

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