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// Other services

Port 32635: SecureNotebook-CLNT

Port 32635 is assigned by IANA to sec-ntb-clnt (SecureNotebook-CLNT).

32635

How sec-ntb-clnt works

Other services
client:32635sec-ntb-clntresponse client:32635sec-ntb-clntresponse

The client sends a request to port 32635 and the sec-ntb-clnt 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 32635 dangerous?

We have no specific security note for port 32635. 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 32635

ServicePortTransportDescriptionReferenceUpdated
sec-ntb-clnt 32635 TCP, UDP SecureNotebook-CLNT - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 32635, and is it reachable?

Linux

sudo ss -ltnup 'sport = :32635'      # process listening on 32635
sudo lsof -nP -i :32635

macOS

sudo lsof -nP -i :32635

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 32635 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 32635
netstat -ano | findstr :32635

From another machine

nmap -p 32635 -sV <host>
sudo nmap -sU -p 32635 <host>
nc -zv <host> 32635

Block it in the firewall

sudo ufw deny 32635/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 32635" -Direction Inbound -LocalPort 32635 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 32635 used for?

Port 32635 is assigned by IANA to sec-ntb-clnt (SecureNotebook-CLNT).

Is port 32635 TCP or UDP?

Port 32635 is registered for TCP and UDP.

Is it safe to open port 32635?

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 32635 is open?

On Linux run "ss -ltnup 'sport = :32635'", on macOS "lsof -nP -i :32635", and on Windows "netstat -ano | findstr :32635" to see the local process. From another machine, "nmap -p 32635 <host>" shows whether it is reachable.

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