CyberHunter
Local dataset, no network
// Other services

Port 4353: F5 iQuery

Port 4353 is assigned by IANA to f5-iquery (F5 iQuery).

4353

How f5-iquery works

Other services
client:4353f5-iqueryresponse client:4353f5-iqueryresponse

The client sends a request to port 4353 and the f5-iquery 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 4353 dangerous?

We have no specific security note for port 4353. 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 4353

ServicePortTransportDescriptionReferenceUpdated
f5-iquery 4353 TCP, UDP F5 iQuery - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4353, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4353'      # process listening on 4353
sudo lsof -nP -i :4353

macOS

sudo lsof -nP -i :4353

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4353 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4353
netstat -ano | findstr :4353

From another machine

nmap -p 4353 -sV <host>
sudo nmap -sU -p 4353 <host>
nc -zv <host> 4353

Block it in the firewall

sudo ufw deny 4353/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4353" -Direction Inbound -LocalPort 4353 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4353 used for?

Port 4353 is assigned by IANA to f5-iquery (F5 iQuery).

Is port 4353 TCP or UDP?

Port 4353 is registered for TCP and UDP.

Is it safe to open port 4353?

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 4353 is open?

On Linux run "ss -ltnup 'sport = :4353'", on macOS "lsof -nP -i :4353", and on Windows "netstat -ano | findstr :4353" to see the local process. From another machine, "nmap -p 4353 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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