Port 4753SIMON (Simple Invocation of Methods Over Network)

SIMON is an obscure IANA-assigned service name for Simple Invocation of Methods Over Network on TCP port 4753.

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

1 other service is registered on port 4753. compare all 2 →

Technical Details

what runs on :4753

SIMON (Simple Invocation of Methods Over Network) is registered on port :4753 over tcp to Alexander Christian, assigned April 2012. 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 :4753

this machine

# linux
sudo ss -tlpn 'sport = :4753'

# macos / bsd
sudo lsof -nP -i :4753

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4753

another host

nmap -sV -p T:4753 <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 :4753

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 :4753 yet

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

Record

iana registry entry

port: :4753
service: SIMON (Simple Invocation of Methods Over Network)
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA assignment identifies SIMON as “Simple Invocation of Methods Over Network” and lists Alexander Christian as the registrant. No widely documented deployment or common listener is known for this port.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4753

Something wrong?

This record is maintained by the engineers who use port 4753. 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 :4753, 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
:4692	Conspiracy messaging	TCPUDP	Voice and Chat	safe	0
:4701	NetXMS Management Server	TCPUDPtls	Remote Access	risk	0
:4691	Monotone Netsync Protocol	TCPUDP	Network Services	caution	0

risk mix of the 8 listed

safe13%
caution75%
risk13%

2 of 8 encrypted

Port :4753SIMON (Simple Invocation of Methods Over Network)

Technical Details

Security Information

Related Ports

Port 4753SIMON (Simple Invocation of Methods Over Network)