- 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.
Port 4756: Reticle Decision Center
Port 4756 is assigned by IANA to RDCenter (Reticle Decision Center).
4756
How RDCenter works
Other servicesThe client sends a request to port 4756 and the RDCenter service answers.
- Transport
- TCP
- 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
Is port 4756 dangerous?
We have no specific security note for port 4756. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 4756
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| RDCenter | 4756 | TCP | Reticle Decision Center | - | 2016-10-17 |
| - | 4756 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 4756, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4756' # process listening on 4756
sudo lsof -nP -i :4756macOS
sudo lsof -nP -i :4756
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4756 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4756 netstat -ano | findstr :4756
From another machine
nmap -p 4756 -sV <host> nc -zv <host> 4756
Block it in the firewall
sudo ufw deny 4756/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4756" -Direction Inbound -LocalPort 4756 -Protocol TCP -Action Block # Windows
What is port 4756 used for?
Port 4756 is assigned by IANA to RDCenter (Reticle Decision Center).
Is port 4756 TCP or UDP?
Port 4756 is registered for TCP.
Is it safe to open port 4756?
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 4756 is open?
On Linux run "ss -ltnup 'sport = :4756'", on macOS "lsof -nP -i :4756", and on Windows "netstat -ano | findstr :4756" to see the local process. From another machine, "nmap -p 4756 <host>" shows whether it is reachable.
Other other services ports
: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