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// Other services

Port 1600: issd

Port 1600 is assigned by IANA to issd (issd).

1600

How issd works

Other services
client:1600issdresponse client:1600issdresponse

The client sends a request to port 1600 and the issd 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 1600 dangerous?

We have no specific security note for port 1600. 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 1600

ServicePortTransportDescriptionReferenceUpdated
issd 1600 TCP, UDP issd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1600, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1600'      # process listening on 1600
sudo lsof -nP -i :1600

macOS

sudo lsof -nP -i :1600

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1600 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1600
netstat -ano | findstr :1600

From another machine

nmap -p 1600 -sV <host>
sudo nmap -sU -p 1600 <host>
nc -zv <host> 1600

Block it in the firewall

sudo ufw deny 1600/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1600" -Direction Inbound -LocalPort 1600 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1600 used for?

Port 1600 is assigned by IANA to issd (issd).

Is port 1600 TCP or UDP?

Port 1600 is registered for TCP and UDP.

Is it safe to open port 1600?

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 1600 is open?

On Linux run "ss -ltnup 'sport = :1600'", on macOS "lsof -nP -i :1600", and on Windows "netstat -ano | findstr :1600" to see the local process. From another machine, "nmap -p 1600 <host>" shows whether it is reachable.

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