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// Other services

Port 4596: IAS-Neighbor (ANRI-ANRI)

Port 4596 is assigned by IANA to ias-neighbor (IAS-Neighbor (ANRI-ANRI)).

4596

How ias-neighbor works

Other services
client:4596ias-neighborresponse client:4596ias-neighborresponse

The client sends a request to port 4596 and the ias-neighbor 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 4596 dangerous?

We have no specific security note for port 4596. 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 4596

ServicePortTransportDescriptionReferenceUpdated
ias-neighbor 4596 TCP, UDP IAS-Neighbor (ANRI-ANRI) - 2007-07-31

// source: IANA service name and port number registry

03 Check it

Which program uses port 4596, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4596'      # process listening on 4596
sudo lsof -nP -i :4596

macOS

sudo lsof -nP -i :4596

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4596 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4596
netstat -ano | findstr :4596

From another machine

nmap -p 4596 -sV <host>
sudo nmap -sU -p 4596 <host>
nc -zv <host> 4596

Block it in the firewall

sudo ufw deny 4596/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4596" -Direction Inbound -LocalPort 4596 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4596 used for?

Port 4596 is assigned by IANA to ias-neighbor (IAS-Neighbor (ANRI-ANRI)).

Is port 4596 TCP or UDP?

Port 4596 is registered for TCP and UDP.

Is it safe to open port 4596?

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 4596 is open?

On Linux run "ss -ltnup 'sport = :4596'", on macOS "lsof -nP -i :4596", and on Windows "netstat -ano | findstr :4596" to see the local process. From another machine, "nmap -p 4596 <host>" shows whether it is reachable.

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