CyberHunter
Local dataset, no network
// Other services

Port 1043: BOINC Client Control

Port 1043 is assigned by IANA to boinc-client (BOINC Client Control).

1043

How boinc-client works

Other services
client:1043boinc-clientresponse client:1043boinc-clientresponse

The client sends a request to port 1043 and the boinc-client 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 1043 dangerous?

We have no specific security note for port 1043. 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 1043

ServicePortTransportDescriptionReferenceUpdated
boinc-client 1043 TCP, UDP BOINC Client Control - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 1043, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1043'      # process listening on 1043
sudo lsof -nP -i :1043

macOS

sudo lsof -nP -i :1043

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1043 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1043
netstat -ano | findstr :1043

From another machine

nmap -p 1043 -sV <host>
sudo nmap -sU -p 1043 <host>
nc -zv <host> 1043

Block it in the firewall

sudo ufw deny 1043/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1043" -Direction Inbound -LocalPort 1043 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1043 used for?

Port 1043 is assigned by IANA to boinc-client (BOINC Client Control).

Is port 1043 TCP or UDP?

Port 1043 is registered for TCP and UDP.

Is it safe to open port 1043?

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 1043 is open?

On Linux run "ss -ltnup 'sport = :1043'", on macOS "lsof -nP -i :1043", and on Windows "netstat -ano | findstr :1043" to see the local process. From another machine, "nmap -p 1043 <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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