CyberHunter
Local dataset, no network
// Other services

Port 2503: NMS-DPNSS

Port 2503 is assigned by IANA to nms-dpnss (NMS-DPNSS).

2503

How nms-dpnss works

Other services
client:2503nms-dpnssresponse client:2503nms-dpnssresponse

The client sends a request to port 2503 and the nms-dpnss 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 2503 dangerous?

We have no specific security note for port 2503. 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 2503

ServicePortTransportDescriptionReferenceUpdated
nms-dpnss 2503 TCP, UDP NMS-DPNSS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2503, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2503'      # process listening on 2503
sudo lsof -nP -i :2503

macOS

sudo lsof -nP -i :2503

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2503 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2503
netstat -ano | findstr :2503

From another machine

nmap -p 2503 -sV <host>
sudo nmap -sU -p 2503 <host>
nc -zv <host> 2503

Block it in the firewall

sudo ufw deny 2503/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2503" -Direction Inbound -LocalPort 2503 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2503 used for?

Port 2503 is assigned by IANA to nms-dpnss (NMS-DPNSS).

Is port 2503 TCP or UDP?

Port 2503 is registered for TCP and UDP.

Is it safe to open port 2503?

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 2503 is open?

On Linux run "ss -ltnup 'sport = :2503'", on macOS "lsof -nP -i :2503", and on Windows "netstat -ano | findstr :2503" to see the local process. From another machine, "nmap -p 2503 <host>" shows whether it is reachable.

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