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// Other services

Port 33656: SNIP Slave

Port 33656 is assigned by IANA to snip-slave (SNIP Slave).

33656

How snip-slave works

Other services
client:33656snip-slaveresponse client:33656snip-slaveresponse

The client sends a request to port 33656 and the snip-slave 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 33656 dangerous?

We have no specific security note for port 33656. 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 33656

ServicePortTransportDescriptionReferenceUpdated
snip-slave 33656 TCP, UDP SNIP Slave - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 33656, and is it reachable?

Linux

sudo ss -ltnup 'sport = :33656'      # process listening on 33656
sudo lsof -nP -i :33656

macOS

sudo lsof -nP -i :33656

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 33656 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 33656
netstat -ano | findstr :33656

From another machine

nmap -p 33656 -sV <host>
sudo nmap -sU -p 33656 <host>
nc -zv <host> 33656

Block it in the firewall

sudo ufw deny 33656/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 33656" -Direction Inbound -LocalPort 33656 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 33656 used for?

Port 33656 is assigned by IANA to snip-slave (SNIP Slave).

Is port 33656 TCP or UDP?

Port 33656 is registered for TCP and UDP.

Is it safe to open port 33656?

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 33656 is open?

On Linux run "ss -ltnup 'sport = :33656'", on macOS "lsof -nP -i :33656", and on Windows "netstat -ano | findstr :33656" to see the local process. From another machine, "nmap -p 33656 <host>" shows whether it is reachable.

05 Related
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