CyberHunter
Local dataset, no network
// Other services

Port 381: hp performance data collector

Port 381 is assigned by IANA to hp-collector (hp performance data collector).

381

How hp-collector works

Other services
client:381hp-collectorresponse client:381hp-collectorresponse

The client sends a request to port 381 and the hp-collector 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 381 dangerous?

We have no specific security note for port 381. 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 381

ServicePortTransportDescriptionReferenceUpdated
hp-collector 381 TCP, UDP hp performance data collector - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 381, and is it reachable?

Linux

sudo ss -ltnup 'sport = :381'      # process listening on 381
sudo lsof -nP -i :381

macOS

sudo lsof -nP -i :381

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 381 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 381
netstat -ano | findstr :381

From another machine

nmap -p 381 -sV <host>
sudo nmap -sU -p 381 <host>
nc -zv <host> 381

Block it in the firewall

sudo ufw deny 381/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 381" -Direction Inbound -LocalPort 381 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 381 used for?

Port 381 is assigned by IANA to hp-collector (hp performance data collector).

Is port 381 TCP or UDP?

Port 381 is registered for TCP and UDP.

Is it safe to open port 381?

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 381 is open?

On Linux run "ss -ltnup 'sport = :381'", on macOS "lsof -nP -i :381", and on Windows "netstat -ano | findstr :381" to see the local process. From another machine, "nmap -p 381 <host>" shows whether it is reachable.

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