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// Other services

Port 499: ISO ILL Protocol

Port 499 is assigned by IANA to iso-ill (ISO ILL Protocol).

499

How iso-ill works

Other services
client:499iso-illresponse client:499iso-illresponse

The client sends a request to port 499 and the iso-ill 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 499 dangerous?

We have no specific security note for port 499. 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 499

ServicePortTransportDescriptionReferenceUpdated
iso-ill 499 TCP, UDP ISO ILL Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 499, and is it reachable?

Linux

sudo ss -ltnup 'sport = :499'      # process listening on 499
sudo lsof -nP -i :499

macOS

sudo lsof -nP -i :499

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 499 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 499
netstat -ano | findstr :499

From another machine

nmap -p 499 -sV <host>
sudo nmap -sU -p 499 <host>
nc -zv <host> 499

Block it in the firewall

sudo ufw deny 499/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 499" -Direction Inbound -LocalPort 499 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 499 used for?

Port 499 is assigned by IANA to iso-ill (ISO ILL Protocol).

Is port 499 TCP or UDP?

Port 499 is registered for TCP and UDP.

Is it safe to open port 499?

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 499 is open?

On Linux run "ss -ltnup 'sport = :499'", on macOS "lsof -nP -i :499", and on Windows "netstat -ano | findstr :499" to see the local process. From another machine, "nmap -p 499 <host>" shows whether it is reachable.

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