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// Other services

Port 9559: P4Runtime gRPC Service

Port 9559 is assigned by IANA to p4runtime (P4Runtime gRPC Service).

9559

How p4runtime works

Other services
client:9559p4runtimeresponse client:9559p4runtimeresponse

The client sends a request to port 9559 and the p4runtime service answers.

Transport
TCP
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 9559 dangerous?

We have no specific security note for port 9559. 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 9559

ServicePortTransportDescriptionReferenceUpdated
p4runtime 9559 TCP P4Runtime gRPC Service - 2020-09-22
-9559-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9559, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9559'      # process listening on 9559
sudo lsof -nP -i :9559

macOS

sudo lsof -nP -i :9559

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9559 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9559
netstat -ano | findstr :9559

From another machine

nmap -p 9559 -sV <host>
nc -zv <host> 9559

Block it in the firewall

sudo ufw deny 9559/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9559" -Direction Inbound -LocalPort 9559 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9559 used for?

Port 9559 is assigned by IANA to p4runtime (P4Runtime gRPC Service).

Is port 9559 TCP or UDP?

Port 9559 is registered for TCP.

Is it safe to open port 9559?

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 9559 is open?

On Linux run "ss -ltnup 'sport = :9559'", on macOS "lsof -nP -i :9559", and on Windows "netstat -ano | findstr :9559" to see the local process. From another machine, "nmap -p 9559 <host>" shows whether it is reachable.

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