CyberHunter
Local dataset, no network
// Other services

Port 202: AppleTalk Name Binding

Port 202 is assigned by IANA to at-nbp (AppleTalk Name Binding).

202

How at-nbp works

Other services
client:202at-nbpresponse client:202at-nbpresponse

The client sends a request to port 202 and the at-nbp 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 202 dangerous?

We have no specific security note for port 202. 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 202

ServicePortTransportDescriptionReferenceUpdated
at-nbp 202 TCP, UDP AppleTalk Name Binding - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 202, and is it reachable?

Linux

sudo ss -ltnup 'sport = :202'      # process listening on 202
sudo lsof -nP -i :202

macOS

sudo lsof -nP -i :202

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 202 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 202
netstat -ano | findstr :202

From another machine

nmap -p 202 -sV <host>
sudo nmap -sU -p 202 <host>
nc -zv <host> 202

Block it in the firewall

sudo ufw deny 202/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 202" -Direction Inbound -LocalPort 202 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 202 used for?

Port 202 is assigned by IANA to at-nbp (AppleTalk Name Binding).

Is port 202 TCP or UDP?

Port 202 is registered for TCP and UDP.

Is it safe to open port 202?

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 202 is open?

On Linux run "ss -ltnup 'sport = :202'", on macOS "lsof -nP -i :202", and on Windows "netstat -ano | findstr :202" to see the local process. From another machine, "nmap -p 202 <host>" shows whether it is reachable.

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