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// Other services

Port 346: Zebra server

Port 346 is assigned by IANA to zserv (Zebra server).

346

How zserv works

Other services
client:346zservresponse client:346zservresponse

The client sends a request to port 346 and the zserv 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 346 dangerous?

We have no specific security note for port 346. 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 346

ServicePortTransportDescriptionReferenceUpdated
zserv 346 TCP, UDP Zebra server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 346, and is it reachable?

Linux

sudo ss -ltnup 'sport = :346'      # process listening on 346
sudo lsof -nP -i :346

macOS

sudo lsof -nP -i :346

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 346 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 346
netstat -ano | findstr :346

From another machine

nmap -p 346 -sV <host>
sudo nmap -sU -p 346 <host>
nc -zv <host> 346

Block it in the firewall

sudo ufw deny 346/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 346" -Direction Inbound -LocalPort 346 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 346 used for?

Port 346 is assigned by IANA to zserv (Zebra server).

Is port 346 TCP or UDP?

Port 346 is registered for TCP and UDP.

Is it safe to open port 346?

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 346 is open?

On Linux run "ss -ltnup 'sport = :346'", on macOS "lsof -nP -i :346", and on Windows "netstat -ano | findstr :346" to see the local process. From another machine, "nmap -p 346 <host>" shows whether it is reachable.

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