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// Other services

Port 19283: Key Server for SASSAFRAS

Port 19283 is assigned by IANA to keysrvr (Key Server for SASSAFRAS).

19283

How keysrvr works

Other services
client:19283keysrvrresponse client:19283keysrvrresponse

The client sends a request to port 19283 and the keysrvr 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 19283 dangerous?

We have no specific security note for port 19283. 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 19283

ServicePortTransportDescriptionReferenceUpdated
keysrvr 19283 TCP, UDP Key Server for SASSAFRAS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 19283, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19283'      # process listening on 19283
sudo lsof -nP -i :19283

macOS

sudo lsof -nP -i :19283

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19283 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19283
netstat -ano | findstr :19283

From another machine

nmap -p 19283 -sV <host>
sudo nmap -sU -p 19283 <host>
nc -zv <host> 19283

Block it in the firewall

sudo ufw deny 19283/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19283" -Direction Inbound -LocalPort 19283 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 19283 used for?

Port 19283 is assigned by IANA to keysrvr (Key Server for SASSAFRAS).

Is port 19283 TCP or UDP?

Port 19283 is registered for TCP and UDP.

Is it safe to open port 19283?

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 19283 is open?

On Linux run "ss -ltnup 'sport = :19283'", on macOS "lsof -nP -i :19283", and on Windows "netstat -ano | findstr :19283" to see the local process. From another machine, "nmap -p 19283 <host>" shows whether it is reachable.

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