CyberHunter
Local dataset, no network
// Other services

Port 206: AppleTalk Zone Information

Port 206 is assigned by IANA to at-zis (AppleTalk Zone Information).

206

How at-zis works

Other services
client:206at-zisresponse client:206at-zisresponse

The client sends a request to port 206 and the at-zis 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 206 dangerous?

We have no specific security note for port 206. 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 206

ServicePortTransportDescriptionReferenceUpdated
at-zis 206 TCP, UDP AppleTalk Zone Information - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 206, and is it reachable?

Linux

sudo ss -ltnup 'sport = :206'      # process listening on 206
sudo lsof -nP -i :206

macOS

sudo lsof -nP -i :206

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 206 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 206
netstat -ano | findstr :206

From another machine

nmap -p 206 -sV <host>
sudo nmap -sU -p 206 <host>
nc -zv <host> 206

Block it in the firewall

sudo ufw deny 206/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 206" -Direction Inbound -LocalPort 206 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 206 used for?

Port 206 is assigned by IANA to at-zis (AppleTalk Zone Information).

Is port 206 TCP or UDP?

Port 206 is registered for TCP and UDP.

Is it safe to open port 206?

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 206 is open?

On Linux run "ss -ltnup 'sport = :206'", on macOS "lsof -nP -i :206", and on Windows "netstat -ano | findstr :206" to see the local process. From another machine, "nmap -p 206 <host>" shows whether it is reachable.

05 Related
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