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// Other services

Port 997:

Port 997 is assigned by IANA to maitrd ().

997

How maitrd works

Other services
client:997maitrdresponse client:997maitrdresponse

The client sends a request to port 997 and the maitrd 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 997 dangerous?

We have no specific security note for port 997. 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 997

ServicePortTransportDescriptionReferenceUpdated
maitrd 997 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 997, and is it reachable?

Linux

sudo ss -ltnup 'sport = :997'      # process listening on 997
sudo lsof -nP -i :997

macOS

sudo lsof -nP -i :997

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 997 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 997
netstat -ano | findstr :997

From another machine

nmap -p 997 -sV <host>
sudo nmap -sU -p 997 <host>
nc -zv <host> 997

Block it in the firewall

sudo ufw deny 997/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 997" -Direction Inbound -LocalPort 997 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 997 used for?

Port 997 is assigned by IANA to maitrd ().

Is port 997 TCP or UDP?

Port 997 is registered for TCP and UDP.

Is it safe to open port 997?

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 997 is open?

On Linux run "ss -ltnup 'sport = :997'", on macOS "lsof -nP -i :997", and on Windows "netstat -ano | findstr :997" to see the local process. From another machine, "nmap -p 997 <host>" shows whether it is reachable.

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