CyberHunter
Local dataset, no network
// Other services

Port 2551: ISG UDA Server

Port 2551 is assigned by IANA to isg-uda-server (ISG UDA Server).

2551

How isg-uda-server works

Other services
client:2551isg-uda-serverresponse client:2551isg-uda-serverresponse

The client sends a request to port 2551 and the isg-uda-server 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 2551 dangerous?

We have no specific security note for port 2551. 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 2551

ServicePortTransportDescriptionReferenceUpdated
isg-uda-server 2551 TCP, UDP ISG UDA Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2551, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2551'      # process listening on 2551
sudo lsof -nP -i :2551

macOS

sudo lsof -nP -i :2551

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2551 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2551
netstat -ano | findstr :2551

From another machine

nmap -p 2551 -sV <host>
sudo nmap -sU -p 2551 <host>
nc -zv <host> 2551

Block it in the firewall

sudo ufw deny 2551/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2551" -Direction Inbound -LocalPort 2551 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2551 used for?

Port 2551 is assigned by IANA to isg-uda-server (ISG UDA Server).

Is port 2551 TCP or UDP?

Port 2551 is registered for TCP and UDP.

Is it safe to open port 2551?

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 2551 is open?

On Linux run "ss -ltnup 'sport = :2551'", on macOS "lsof -nP -i :2551", and on Windows "netstat -ano | findstr :2551" to see the local process. From another machine, "nmap -p 2551 <host>" shows whether it is reachable.

05 Related
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