CyberHunter
Local dataset, no network
// Other services

Port 2657: SNS Dispatcher

Port 2657 is assigned by IANA to sns-dispatcher (SNS Dispatcher).

2657

How sns-dispatcher works

Other services
client:2657sns-dispatcherresponse client:2657sns-dispatcherresponse

The client sends a request to port 2657 and the sns-dispatcher 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 2657 dangerous?

We have no specific security note for port 2657. 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 2657

ServicePortTransportDescriptionReferenceUpdated
sns-dispatcher 2657 TCP, UDP SNS Dispatcher - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2657, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2657'      # process listening on 2657
sudo lsof -nP -i :2657

macOS

sudo lsof -nP -i :2657

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2657 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2657
netstat -ano | findstr :2657

From another machine

nmap -p 2657 -sV <host>
sudo nmap -sU -p 2657 <host>
nc -zv <host> 2657

Block it in the firewall

sudo ufw deny 2657/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2657" -Direction Inbound -LocalPort 2657 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2657 used for?

Port 2657 is assigned by IANA to sns-dispatcher (SNS Dispatcher).

Is port 2657 TCP or UDP?

Port 2657 is registered for TCP and UDP.

Is it safe to open port 2657?

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 2657 is open?

On Linux run "ss -ltnup 'sport = :2657'", on macOS "lsof -nP -i :2657", and on Windows "netstat -ano | findstr :2657" to see the local process. From another machine, "nmap -p 2657 <host>" shows whether it is reachable.

05 Related
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