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// Other services

Port 10542: MOS Low Priority Port

Port 10542 is assigned by IANA to MOS-aux (MOS Low Priority Port).

10542

How MOS-aux works

Other services
client:10542MOS-auxresponse client:10542MOS-auxresponse

The client sends a request to port 10542 and the MOS-aux 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 10542 dangerous?

We have no specific security note for port 10542. 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 10542

ServicePortTransportDescriptionReferenceUpdated
MOS-aux 10542 TCP, UDP MOS Low Priority Port - 2007-09-17

// source: IANA service name and port number registry

03 Check it

Which program uses port 10542, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10542'      # process listening on 10542
sudo lsof -nP -i :10542

macOS

sudo lsof -nP -i :10542

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10542 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10542
netstat -ano | findstr :10542

From another machine

nmap -p 10542 -sV <host>
sudo nmap -sU -p 10542 <host>
nc -zv <host> 10542

Block it in the firewall

sudo ufw deny 10542/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10542" -Direction Inbound -LocalPort 10542 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 10542 used for?

Port 10542 is assigned by IANA to MOS-aux (MOS Low Priority Port).

Is port 10542 TCP or UDP?

Port 10542 is registered for TCP and UDP.

Is it safe to open port 10542?

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 10542 is open?

On Linux run "ss -ltnup 'sport = :10542'", on macOS "lsof -nP -i :10542", and on Windows "netstat -ano | findstr :10542" to see the local process. From another machine, "nmap -p 10542 <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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