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// Other services

Port 1642: isis-am

Port 1642 is assigned by IANA to isis-am (isis-am).

1642

How isis-am works

Other services
client:1642isis-amresponse client:1642isis-amresponse

The client sends a request to port 1642 and the isis-am 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 1642 dangerous?

We have no specific security note for port 1642. 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 1642

ServicePortTransportDescriptionReferenceUpdated
isis-am 1642 TCP, UDP isis-am - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1642, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1642'      # process listening on 1642
sudo lsof -nP -i :1642

macOS

sudo lsof -nP -i :1642

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1642 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1642
netstat -ano | findstr :1642

From another machine

nmap -p 1642 -sV <host>
sudo nmap -sU -p 1642 <host>
nc -zv <host> 1642

Block it in the firewall

sudo ufw deny 1642/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1642" -Direction Inbound -LocalPort 1642 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1642 used for?

Port 1642 is assigned by IANA to isis-am (isis-am).

Is port 1642 TCP or UDP?

Port 1642 is registered for TCP and UDP.

Is it safe to open port 1642?

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 1642 is open?

On Linux run "ss -ltnup 'sport = :1642'", on macOS "lsof -nP -i :1642", and on Windows "netstat -ano | findstr :1642" to see the local process. From another machine, "nmap -p 1642 <host>" shows whether it is reachable.

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