CyberHunter
Local dataset, no network
// Other services

Port 525: timeserver

Port 525 is assigned by IANA to timed (timeserver).

525

How timed works

Other services
client:525timedresponse client:525timedresponse

The client sends a request to port 525 and the timed 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 525 dangerous?

We have no specific security note for port 525. 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 525

ServicePortTransportDescriptionReferenceUpdated
timed 525 TCP, UDP timeserver - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 525, and is it reachable?

Linux

sudo ss -ltnup 'sport = :525'      # process listening on 525
sudo lsof -nP -i :525

macOS

sudo lsof -nP -i :525

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 525 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 525
netstat -ano | findstr :525

From another machine

nmap -p 525 -sV <host>
sudo nmap -sU -p 525 <host>
nc -zv <host> 525

Block it in the firewall

sudo ufw deny 525/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 525" -Direction Inbound -LocalPort 525 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 525 used for?

Port 525 is assigned by IANA to timed (timeserver).

Is port 525 TCP or UDP?

Port 525 is registered for TCP and UDP.

Is it safe to open port 525?

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 525 is open?

On Linux run "ss -ltnup 'sport = :525'", on macOS "lsof -nP -i :525", and on Windows "netstat -ano | findstr :525" to see the local process. From another machine, "nmap -p 525 <host>" shows whether it is reachable.

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