Port 4756Reticle Decision Center

TCP port assigned to KLA Tencor's Reticle Decision Center; public protocol and deployment details are not documented.

transport: tcp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as RDCenter

Technical Details

what runs on :4756

Reticle Decision Center is registered on port :4756 over tcp to KLA Tencor, assigned October 2016. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :4756

this machine

# linux
sudo ss -tlpn 'sport = :4756'

# macos / bsd
sudo lsof -nP -i :4756

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4756

another host

nmap -sV -p T:4756 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :4756

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

no security notes recorded for :4756 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :4756
service: Reticle Decision Center
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns TCP port 4756 to Reticle Decision Center and lists KLA Tencor as the registrant. The registry provides no further details about its deployment or protocol.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4756

Something wrong?

This record is maintained by the engineers who use port 4756. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-06.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :4756, by lookups.

port	service	proto	category	risk	views
:4712	McAfee Web Gateway GUI	TCPtls	Web Services	caution	24.8k
:4711	McAfee Web Gateway HTTP GUI	TCP	Web Services	caution	22.3k
:4747	Apprentice	TCP	Remote Access	caution	11.6k
:4728	CA DMP / Port Multiplexer	TCP	Network Services	caution	10.0k
:4750	BladeLogic Agent	TCP	Network Services	caution	8.7k
:4701	NetXMS Management Server	TCPUDPtls	Remote Access	risk	0
:4702	NetXMS Server Synchronization	TCPUDP	Network Services	safe	0
:4692	Conspiracy messaging	TCPUDP	Voice and Chat	safe	0

risk mix of the 8 listed

safe25%
caution63%
risk13%

2 of 8 encrypted

Port :4756Reticle Decision Center

Technical Details

Security Information

Related Ports

Port 4756Reticle Decision Center