Port 4486Integrated Client Message Service

TCP and UDP port 4486 are assigned to Integrated Client Message Service (ICMS), a little-documented service with no widely observed public deployment.

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

also known as icms

Technical Details

what runs on :4486

Integrated Client Message Service is registered on port :4486 over tcp and udp to Resource Allocation, assigned September 2010. 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 :4486

this machine

# linux
sudo ss -tulpn 'sport = :4486'

# macos / bsd
sudo lsof -nP -i :4486

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4486

another host

nmap -sV -p T:4486 <host>
sudo nmap -sU -sV -p U:4486 <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 :4486

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 · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :4486 yet

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

Record

iana registry entry

port: :4486
service: Integrated Client Message Service
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns port 4486 to Integrated Client Message Service (ICMS), registered to Resource Allocation. No common product or public deployment is established.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: IANA service name registry — port 4486

Something wrong?

This record is maintained by the engineers who use port 4486. 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 2026-10-05.

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 :4486, by lookups.

port	service	proto	category	risk	views
:4500	IPSec NAT Traversal	UDPtls	Security	caution	15.8k
:4534	Armagetron Advanced	UDP	Gaming	caution	9.4k
:4433	Axence nVision	TCP	Security	caution	8.9k
:4443	Pharos	TCPUDP	—	safe	0
:4447	N1-RMGMT	TCPUDP	—	safe	0
:4536	Event Heap Server SSL	TCPUDPtls	Network Services	safe	0
:4449	PrivateWire	TCPUDP	—	safe	0
:4444	Kerberos 524	TCPUDP	Security	caution	0

risk mix of the 8 listed

safe50%
caution50%

2 of 8 encrypted

Port :4486Integrated Client Message Service

Technical Details

Security Information

Related Ports

Port 4486Integrated Client Message Service