Port 5583T-Mobile SMS Protocol Message 2

Port 5583 is assigned to T-Mobile SMS Protocol Message 2 over TCP and UDP.

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

also known as tmo-icon-sync

Technical Details

what runs on :5583

T-Mobile SMS Protocol Message 2 is registered on port :5583 over tcp and udp to Donghwan Lim, assigned January 2008. 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 found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :5583

this machine

# linux
sudo ss -tulpn 'sport = :5583'

# macos / bsd
sudo lsof -nP -i :5583

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5583

another host

nmap -sV -p T:5583 <host>
sudo nmap -sU -sV -p U:5583 <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 :5583

risk score

1/ 10safe

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

mobile averages 2.2 across 67 ports — this one sits 1.2 below.

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 :5583 yet

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

Record

iana registry entry

port: :5583
service: T-Mobile SMS Protocol Message 2
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Mobile
usage: This assignment identifies T-Mobile SMS Protocol Message 2 on TCP and UDP port 5583. The service is registered to Donghwan Lim, but public deployment and implementation details are not established.
lookups: 0rank 993
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 5583

Something wrong?

This record is maintained by the engineers who use port 5583. 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 2026-09-06.

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

all 67 in mobile →

the 8 most looked-up other ports in mobile — 67 ports carry that label.

port	service	proto	category	risk	views
:8882	Atlasz Secure App Server	TCP	Web Services	caution	66.9k
:2082	Infowave Mobility	TCP	Network Services	caution	17.7k
:3386	GTP (GPRS Tunneling Protocol)	TCPUDP	Network Services	caution	16.7k
:7401	RTPS DDS Traffic	TCPUDP	Network Services	safe	14.7k
:2948	WAP Push MMS	TCPUDP	Network Services	safe	11.7k
:5222	XMPP Client Connection	TCP	Network Services	caution	11.7k
:3006	Miralix SMS Connector	TCP	Mobile	caution	11.3k
:2949	WAP Pushsecure MMS	TCPUDP	Cloud	safe	10.4k

risk mix of the 8 listed

safe38%
caution63%

0 of 8 encrypted

Port :5583T-Mobile SMS Protocol Message 2

Technical Details

Security Information

Related Ports

Port 5583T-Mobile SMS Protocol Message 2