CyberHunter
Local dataset, no network
// Other services

Port 1966: Slush

Port 1966 is assigned by IANA to slush (Slush).

1966

How slush works

Other services
client:1966slushresponse client:1966slushresponse

The client sends a request to port 1966 and the slush 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 1966 dangerous?

We have no specific security note for port 1966. 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 1966

ServicePortTransportDescriptionReferenceUpdated
slush 1966 TCP, UDP Slush - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1966, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1966'      # process listening on 1966
sudo lsof -nP -i :1966

macOS

sudo lsof -nP -i :1966

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1966 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1966
netstat -ano | findstr :1966

From another machine

nmap -p 1966 -sV <host>
sudo nmap -sU -p 1966 <host>
nc -zv <host> 1966

Block it in the firewall

sudo ufw deny 1966/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1966" -Direction Inbound -LocalPort 1966 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1966 used for?

Port 1966 is assigned by IANA to slush (Slush).

Is port 1966 TCP or UDP?

Port 1966 is registered for TCP and UDP.

Is it safe to open port 1966?

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 1966 is open?

On Linux run "ss -ltnup 'sport = :1966'", on macOS "lsof -nP -i :1966", and on Windows "netstat -ano | findstr :1966" to see the local process. From another machine, "nmap -p 1966 <host>" shows whether it is reachable.

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