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// Other services

Port 4845: WordCruncher Remote Library Service

Port 4845 is assigned by IANA to wcr-remlib (WordCruncher Remote Library Service).

4845

How wcr-remlib works

Other services
client:4845wcr-remlibresponse client:4845wcr-remlibresponse

The client sends a request to port 4845 and the wcr-remlib 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 4845 dangerous?

We have no specific security note for port 4845. 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 4845

ServicePortTransportDescriptionReferenceUpdated
wcr-remlib 4845 TCP, UDP WordCruncher Remote Library Service - 2008-03-17

// source: IANA service name and port number registry

03 Check it

Which program uses port 4845, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4845'      # process listening on 4845
sudo lsof -nP -i :4845

macOS

sudo lsof -nP -i :4845

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4845 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4845
netstat -ano | findstr :4845

From another machine

nmap -p 4845 -sV <host>
sudo nmap -sU -p 4845 <host>
nc -zv <host> 4845

Block it in the firewall

sudo ufw deny 4845/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4845" -Direction Inbound -LocalPort 4845 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4845 used for?

Port 4845 is assigned by IANA to wcr-remlib (WordCruncher Remote Library Service).

Is port 4845 TCP or UDP?

Port 4845 is registered for TCP and UDP.

Is it safe to open port 4845?

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 4845 is open?

On Linux run "ss -ltnup 'sport = :4845'", on macOS "lsof -nP -i :4845", and on Windows "netstat -ano | findstr :4845" to see the local process. From another machine, "nmap -p 4845 <host>" shows whether it is reachable.

05 Related
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