CyberHunter
Local dataset, no network
// Other services

Port 377: NEC Corporation

Port 377 is assigned by IANA to tnETOS (NEC Corporation).

377

How tnETOS works

Other services
client:377tnETOSresponse client:377tnETOSresponse

The client sends a request to port 377 and the tnETOS 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 377 dangerous?

We have no specific security note for port 377. 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 377

ServicePortTransportDescriptionReferenceUpdated
tnETOS 377 TCP, UDP NEC Corporation - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 377, and is it reachable?

Linux

sudo ss -ltnup 'sport = :377'      # process listening on 377
sudo lsof -nP -i :377

macOS

sudo lsof -nP -i :377

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 377 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 377
netstat -ano | findstr :377

From another machine

nmap -p 377 -sV <host>
sudo nmap -sU -p 377 <host>
nc -zv <host> 377

Block it in the firewall

sudo ufw deny 377/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 377" -Direction Inbound -LocalPort 377 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 377 used for?

Port 377 is assigned by IANA to tnETOS (NEC Corporation).

Is port 377 TCP or UDP?

Port 377 is registered for TCP and UDP.

Is it safe to open port 377?

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 377 is open?

On Linux run "ss -ltnup 'sport = :377'", on macOS "lsof -nP -i :377", and on Windows "netstat -ano | findstr :377" to see the local process. From another machine, "nmap -p 377 <host>" shows whether it is reachable.

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