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// Other services

Port 1242: NMAS over IP

Port 1242 is assigned by IANA to nmasoverip (NMAS over IP).

1242

How nmasoverip works

Other services
client:1242nmasoveripresponse client:1242nmasoveripresponse

The client sends a request to port 1242 and the nmasoverip 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 1242 dangerous?

We have no specific security note for port 1242. 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 1242

ServicePortTransportDescriptionReferenceUpdated
nmasoverip 1242 TCP, UDP NMAS over IP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1242, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1242'      # process listening on 1242
sudo lsof -nP -i :1242

macOS

sudo lsof -nP -i :1242

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1242 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1242
netstat -ano | findstr :1242

From another machine

nmap -p 1242 -sV <host>
sudo nmap -sU -p 1242 <host>
nc -zv <host> 1242

Block it in the firewall

sudo ufw deny 1242/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1242" -Direction Inbound -LocalPort 1242 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1242 used for?

Port 1242 is assigned by IANA to nmasoverip (NMAS over IP).

Is port 1242 TCP or UDP?

Port 1242 is registered for TCP and UDP.

Is it safe to open port 1242?

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 1242 is open?

On Linux run "ss -ltnup 'sport = :1242'", on macOS "lsof -nP -i :1242", and on Windows "netstat -ano | findstr :1242" to see the local process. From another machine, "nmap -p 1242 <host>" shows whether it is reachable.

05 Related
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