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// Other services

Port 1503: Databeam

Port 1503 is assigned by IANA to imtc-mcs (Databeam).

1503

How imtc-mcs works

Other services
client:1503imtc-mcsresponse client:1503imtc-mcsresponse

The client sends a request to port 1503 and the imtc-mcs service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1503 dangerous?

We have no specific security note for port 1503. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1503

ServicePortTransportDescriptionReferenceUpdated
imtc-mcs 1503 TCP, UDP Databeam - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1503, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1503'      # process listening on 1503
sudo lsof -nP -i :1503

macOS

sudo lsof -nP -i :1503

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1503 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1503
netstat -ano | findstr :1503

From another machine

nmap -p 1503 -sV <host>
sudo nmap -sU -p 1503 <host>
nc -zv <host> 1503

Block it in the firewall

sudo ufw deny 1503/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1503" -Direction Inbound -LocalPort 1503 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1503 used for?

Port 1503 is assigned by IANA to imtc-mcs (Databeam).

Is port 1503 TCP or UDP?

Port 1503 is registered for TCP and UDP.

Is it safe to open port 1503?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1503 is open?

On Linux run "ss -ltnup 'sport = :1503'", on macOS "lsof -nP -i :1503", and on Windows "netstat -ano | findstr :1503" to see the local process. From another machine, "nmap -p 1503 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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