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// Other services

Port 4443: Pharos

Port 4443 is assigned by IANA to pharos (Pharos).

4443

How pharos works

Other services
client:4443pharosresponse client:4443pharosresponse

The client sends a request to port 4443 and the pharos 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 4443 dangerous?

We have no specific security note for port 4443. 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 4443

ServicePortTransportDescriptionReferenceUpdated
pharos 4443 TCP, UDP Pharos
Reported: Known Unauthorized Use on port 4443
 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4443, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4443'      # process listening on 4443
sudo lsof -nP -i :4443

macOS

sudo lsof -nP -i :4443

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4443 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4443
netstat -ano | findstr :4443

From another machine

nmap -p 4443 -sV <host>
sudo nmap -sU -p 4443 <host>
nc -zv <host> 4443

Block it in the firewall

sudo ufw deny 4443/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4443" -Direction Inbound -LocalPort 4443 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4443 used for?

Port 4443 is assigned by IANA to pharos (Pharos).

Is port 4443 TCP or UDP?

Port 4443 is registered for TCP and UDP.

Is it safe to open port 4443?

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 4443 is open?

On Linux run "ss -ltnup 'sport = :4443'", on macOS "lsof -nP -i :4443", and on Windows "netstat -ano | findstr :4443" to see the local process. From another machine, "nmap -p 4443 <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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