CyberHunter
Local dataset, no network
// Other services

Port 2761: DICOM ISCL

Port 2761 is assigned by IANA to dicom-iscl (DICOM ISCL).

2761

How dicom-iscl works

Other services
client:2761dicom-isclresponse client:2761dicom-isclresponse

The client sends a request to port 2761 and the dicom-iscl 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 2761 dangerous?

We have no specific security note for port 2761. 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 2761

ServicePortTransportDescriptionReferenceUpdated
dicom-iscl 2761 TCP, UDP DICOM ISCL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2761, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2761'      # process listening on 2761
sudo lsof -nP -i :2761

macOS

sudo lsof -nP -i :2761

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2761 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2761
netstat -ano | findstr :2761

From another machine

nmap -p 2761 -sV <host>
sudo nmap -sU -p 2761 <host>
nc -zv <host> 2761

Block it in the firewall

sudo ufw deny 2761/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2761" -Direction Inbound -LocalPort 2761 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2761 used for?

Port 2761 is assigned by IANA to dicom-iscl (DICOM ISCL).

Is port 2761 TCP or UDP?

Port 2761 is registered for TCP and UDP.

Is it safe to open port 2761?

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 2761 is open?

On Linux run "ss -ltnup 'sport = :2761'", on macOS "lsof -nP -i :2761", and on Windows "netstat -ano | findstr :2761" to see the local process. From another machine, "nmap -p 2761 <host>" shows whether it is reachable.

05 Related
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