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// Other services

Port 5403: HPOMS-CI-LSTN

Port 5403 is assigned by IANA to hpoms-ci-lstn (HPOMS-CI-LSTN).

5403

How hpoms-ci-lstn works

Other services
client:5403hpoms-ci-lstnresponse client:5403hpoms-ci-lstnresponse

The client sends a request to port 5403 and the hpoms-ci-lstn 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 5403 dangerous?

We have no specific security note for port 5403. 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 5403

ServicePortTransportDescriptionReferenceUpdated
hpoms-ci-lstn 5403 TCP, UDP HPOMS-CI-LSTN - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5403, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5403'      # process listening on 5403
sudo lsof -nP -i :5403

macOS

sudo lsof -nP -i :5403

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5403 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5403
netstat -ano | findstr :5403

From another machine

nmap -p 5403 -sV <host>
sudo nmap -sU -p 5403 <host>
nc -zv <host> 5403

Block it in the firewall

sudo ufw deny 5403/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5403" -Direction Inbound -LocalPort 5403 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5403 used for?

Port 5403 is assigned by IANA to hpoms-ci-lstn (HPOMS-CI-LSTN).

Is port 5403 TCP or UDP?

Port 5403 is registered for TCP and UDP.

Is it safe to open port 5403?

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 5403 is open?

On Linux run "ss -ltnup 'sport = :5403'", on macOS "lsof -nP -i :5403", and on Windows "netstat -ano | findstr :5403" to see the local process. From another machine, "nmap -p 5403 <host>" shows whether it is reachable.

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