CyberHunter
Local dataset, no network
// Other services

Port 532: readnews

Port 532 is assigned by IANA to netnews (readnews).

532

How netnews works

Other services
client:532netnewsresponse client:532netnewsresponse

The client sends a request to port 532 and the netnews 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 532 dangerous?

We have no specific security note for port 532. 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 532

ServicePortTransportDescriptionReferenceUpdated
netnews 532 TCP, UDP readnews - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 532, and is it reachable?

Linux

sudo ss -ltnup 'sport = :532'      # process listening on 532
sudo lsof -nP -i :532

macOS

sudo lsof -nP -i :532

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 532 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 532
netstat -ano | findstr :532

From another machine

nmap -p 532 -sV <host>
sudo nmap -sU -p 532 <host>
nc -zv <host> 532

Block it in the firewall

sudo ufw deny 532/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 532" -Direction Inbound -LocalPort 532 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 532 used for?

Port 532 is assigned by IANA to netnews (readnews).

Is port 532 TCP or UDP?

Port 532 is registered for TCP and UDP.

Is it safe to open port 532?

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 532 is open?

On Linux run "ss -ltnup 'sport = :532'", on macOS "lsof -nP -i :532", and on Windows "netstat -ano | findstr :532" to see the local process. From another machine, "nmap -p 532 <host>" shows whether it is reachable.

05 Related
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