Port 15503M Image Storage License Manager

Port assigned to the 3M Image Storage license manager over TCP and UDP.

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

also known as 3m-image-lm

1 other service is registered on port 1550. compare all 2 →

Technical Details

what runs on :1550

3M Image Storage License Manager is registered on port :1550 over tcp and udp to J C Canessa. 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 :1550

this machine

# linux
sudo ss -tulpn 'sport = :1550'

# macos / bsd
sudo lsof -nP -i :1550

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1550

another host

nmap -sV -p T:1550 <host>
sudo nmap -sU -sV -p U:1550 <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 :1550

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 :1550 yet

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

Record

iana registry entry

port: :1550
service: 3M Image Storage License Manager
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns TCP and UDP port 1550 to the Image Storage license manager associated with 3M Company. The registration is attributed to J C Canessa; implementation and deployment details are not recorded.
lookups: 0rank 993
added: 2026-08-31
updated: 2026-08-31
references: IANA service name registry — port 1550

Something wrong?

This record is maintained by the engineers who use port 1550. 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 2026-08-31.

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 :1550, by lookups.

port	service	proto	category	risk	views
:1513	Garena Gaming	TCPUDP	Gaming	caution	33.1k
:1521	Oracle TNS Listener	TCP	Security	caution	19.6k
:1521	Oracle DB Listener	TCP	Databases	caution	18.4k
:1533	IBM Sametime & SQL Server	TCP	Network Services	safe	13.5k
:1526	Oracle Listener Alt Port	TCP	Databases	caution	13.0k
:1500	NetGuard GuardianPro Remote Management	TCP	Security	caution	12.7k
:1503	Live Messenger Whiteboard Sharing	TCPUDP	Network Services	caution	12.4k
:1501	NetGuard GuardianPro Auth Client	UDP	Security	caution	12.0k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :15503M Image Storage License Manager

Technical Details

Security Information

Related Ports

Port 15503M Image Storage License Manager