CyberHunter
Local dataset, no network
// Other services

Port 526: newdate

Port 526 is assigned by IANA to tempo (newdate).

526

How tempo works

Other services
client:526temporesponse client:526temporesponse

The client sends a request to port 526 and the tempo 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 526 dangerous?

We have no specific security note for port 526. 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 526

ServicePortTransportDescriptionReferenceUpdated
tempo 526 TCP, UDP newdate - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 526, and is it reachable?

Linux

sudo ss -ltnup 'sport = :526'      # process listening on 526
sudo lsof -nP -i :526

macOS

sudo lsof -nP -i :526

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 526 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 526
netstat -ano | findstr :526

From another machine

nmap -p 526 -sV <host>
sudo nmap -sU -p 526 <host>
nc -zv <host> 526

Block it in the firewall

sudo ufw deny 526/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 526" -Direction Inbound -LocalPort 526 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 526 used for?

Port 526 is assigned by IANA to tempo (newdate).

Is port 526 TCP or UDP?

Port 526 is registered for TCP and UDP.

Is it safe to open port 526?

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 526 is open?

On Linux run "ss -ltnup 'sport = :526'", on macOS "lsof -nP -i :526", and on Windows "netstat -ano | findstr :526" to see the local process. From another machine, "nmap -p 526 <host>" shows whether it is reachable.

05 Related
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