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// Other services

Port 4143: Document Replication

Port 4143 is assigned by IANA to oidsr (Document Replication).

4143

How oidsr works

Other services
client:4143oidsrresponse client:4143oidsrresponse

The client sends a request to port 4143 and the oidsr 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 4143 dangerous?

We have no specific security note for port 4143. 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 4143

ServicePortTransportDescriptionReferenceUpdated
oidsr 4143 TCP, UDP Document Replication - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4143, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4143'      # process listening on 4143
sudo lsof -nP -i :4143

macOS

sudo lsof -nP -i :4143

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4143 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4143
netstat -ano | findstr :4143

From another machine

nmap -p 4143 -sV <host>
sudo nmap -sU -p 4143 <host>
nc -zv <host> 4143

Block it in the firewall

sudo ufw deny 4143/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4143" -Direction Inbound -LocalPort 4143 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4143 used for?

Port 4143 is assigned by IANA to oidsr (Document Replication).

Is port 4143 TCP or UDP?

Port 4143 is registered for TCP and UDP.

Is it safe to open port 4143?

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 4143 is open?

On Linux run "ss -ltnup 'sport = :4143'", on macOS "lsof -nP -i :4143", and on Windows "netstat -ano | findstr :4143" to see the local process. From another machine, "nmap -p 4143 <host>" shows whether it is reachable.

05 Related
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