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// Other services

Port 519: unixtime

Port 519 is assigned by IANA to utime (unixtime).

519

How utime works

Other services
client:519utimeresponse client:519utimeresponse

The client sends a request to port 519 and the utime 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 519 dangerous?

We have no specific security note for port 519. 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 519

ServicePortTransportDescriptionReferenceUpdated
utime 519 TCP, UDP unixtime - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 519, and is it reachable?

Linux

sudo ss -ltnup 'sport = :519'      # process listening on 519
sudo lsof -nP -i :519

macOS

sudo lsof -nP -i :519

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 519 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 519
netstat -ano | findstr :519

From another machine

nmap -p 519 -sV <host>
sudo nmap -sU -p 519 <host>
nc -zv <host> 519

Block it in the firewall

sudo ufw deny 519/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 519" -Direction Inbound -LocalPort 519 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 519 used for?

Port 519 is assigned by IANA to utime (unixtime).

Is port 519 TCP or UDP?

Port 519 is registered for TCP and UDP.

Is it safe to open port 519?

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 519 is open?

On Linux run "ss -ltnup 'sport = :519'", on macOS "lsof -nP -i :519", and on Windows "netstat -ano | findstr :519" to see the local process. From another machine, "nmap -p 519 <host>" shows whether it is reachable.

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