CyberHunter
Local dataset, no network
// Other services

Port 2856: cesdinv

Port 2856 is assigned by IANA to cesdinv (cesdinv).

2856

How cesdinv works

Other services
client:2856cesdinvresponse client:2856cesdinvresponse

The client sends a request to port 2856 and the cesdinv 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 2856 dangerous?

We have no specific security note for port 2856. 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 2856

ServicePortTransportDescriptionReferenceUpdated
cesdinv 2856 TCP, UDP cesdinv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2856, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2856'      # process listening on 2856
sudo lsof -nP -i :2856

macOS

sudo lsof -nP -i :2856

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2856 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2856
netstat -ano | findstr :2856

From another machine

nmap -p 2856 -sV <host>
sudo nmap -sU -p 2856 <host>
nc -zv <host> 2856

Block it in the firewall

sudo ufw deny 2856/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2856" -Direction Inbound -LocalPort 2856 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2856 used for?

Port 2856 is assigned by IANA to cesdinv (cesdinv).

Is port 2856 TCP or UDP?

Port 2856 is registered for TCP and UDP.

Is it safe to open port 2856?

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 2856 is open?

On Linux run "ss -ltnup 'sport = :2856'", on macOS "lsof -nP -i :2856", and on Windows "netstat -ano | findstr :2856" to see the local process. From another machine, "nmap -p 2856 <host>" shows whether it is reachable.

05 Related
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