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// Other services

Port 19315: Key Shadow for SASSAFRAS

Port 19315 is assigned by IANA to keyshadow (Key Shadow for SASSAFRAS).

19315

How keyshadow works

Other services
client:19315keyshadowresponse client:19315keyshadowresponse

The client sends a request to port 19315 and the keyshadow 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 19315 dangerous?

We have no specific security note for port 19315. 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 19315

ServicePortTransportDescriptionReferenceUpdated
keyshadow 19315 TCP, UDP Key Shadow for SASSAFRAS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 19315, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19315'      # process listening on 19315
sudo lsof -nP -i :19315

macOS

sudo lsof -nP -i :19315

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19315 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19315
netstat -ano | findstr :19315

From another machine

nmap -p 19315 -sV <host>
sudo nmap -sU -p 19315 <host>
nc -zv <host> 19315

Block it in the firewall

sudo ufw deny 19315/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19315" -Direction Inbound -LocalPort 19315 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 19315 used for?

Port 19315 is assigned by IANA to keyshadow (Key Shadow for SASSAFRAS).

Is port 19315 TCP or UDP?

Port 19315 is registered for TCP and UDP.

Is it safe to open port 19315?

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 19315 is open?

On Linux run "ss -ltnup 'sport = :19315'", on macOS "lsof -nP -i :19315", and on Windows "netstat -ano | findstr :19315" to see the local process. From another machine, "nmap -p 19315 <host>" shows whether it is reachable.

05 Related
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