CyberHunter
Local dataset, no network
// Other services

Port 373: Legent Corporation

Port 373 is assigned by IANA to legent-1 (Legent Corporation).

373

How legent-1 works

Other services
client:373legent-1response client:373legent-1response

The client sends a request to port 373 and the legent-1 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 373 dangerous?

We have no specific security note for port 373. 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 373

ServicePortTransportDescriptionReferenceUpdated
legent-1 373 TCP, UDP Legent Corporation - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 373, and is it reachable?

Linux

sudo ss -ltnup 'sport = :373'      # process listening on 373
sudo lsof -nP -i :373

macOS

sudo lsof -nP -i :373

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 373 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 373
netstat -ano | findstr :373

From another machine

nmap -p 373 -sV <host>
sudo nmap -sU -p 373 <host>
nc -zv <host> 373

Block it in the firewall

sudo ufw deny 373/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 373" -Direction Inbound -LocalPort 373 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 373 used for?

Port 373 is assigned by IANA to legent-1 (Legent Corporation).

Is port 373 TCP or UDP?

Port 373 is registered for TCP and UDP.

Is it safe to open port 373?

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 373 is open?

On Linux run "ss -ltnup 'sport = :373'", on macOS "lsof -nP -i :373", and on Windows "netstat -ano | findstr :373" to see the local process. From another machine, "nmap -p 373 <host>" shows whether it is reachable.

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