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// Other services

Port 658: TenFold

Port 658 is assigned by IANA to tenfold (TenFold).

658

How tenfold works

Other services
client:658tenfoldresponse client:658tenfoldresponse

The client sends a request to port 658 and the tenfold 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 658 dangerous?

We have no specific security note for port 658. 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 658

ServicePortTransportDescriptionReferenceUpdated
tenfold 658 TCP, UDP TenFold - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 658, and is it reachable?

Linux

sudo ss -ltnup 'sport = :658'      # process listening on 658
sudo lsof -nP -i :658

macOS

sudo lsof -nP -i :658

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 658 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 658
netstat -ano | findstr :658

From another machine

nmap -p 658 -sV <host>
sudo nmap -sU -p 658 <host>
nc -zv <host> 658

Block it in the firewall

sudo ufw deny 658/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 658" -Direction Inbound -LocalPort 658 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 658 used for?

Port 658 is assigned by IANA to tenfold (TenFold).

Is port 658 TCP or UDP?

Port 658 is registered for TCP and UDP.

Is it safe to open port 658?

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 658 is open?

On Linux run "ss -ltnup 'sport = :658'", on macOS "lsof -nP -i :658", and on Windows "netstat -ano | findstr :658" to see the local process. From another machine, "nmap -p 658 <host>" shows whether it is reachable.

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