CyberHunter
Local dataset, no network
// Other services

Port 706: SILC

Port 706 is assigned by IANA to silc (SILC).

706

How silc works

Other services
client:706silcresponse client:706silcresponse

The client sends a request to port 706 and the silc 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 706 dangerous?

We have no specific security note for port 706. 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 706

ServicePortTransportDescriptionReferenceUpdated
silc 706 TCP, UDP SILC - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 706, and is it reachable?

Linux

sudo ss -ltnup 'sport = :706'      # process listening on 706
sudo lsof -nP -i :706

macOS

sudo lsof -nP -i :706

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 706 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 706
netstat -ano | findstr :706

From another machine

nmap -p 706 -sV <host>
sudo nmap -sU -p 706 <host>
nc -zv <host> 706

Block it in the firewall

sudo ufw deny 706/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 706" -Direction Inbound -LocalPort 706 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 706 used for?

Port 706 is assigned by IANA to silc (SILC).

Is port 706 TCP or UDP?

Port 706 is registered for TCP and UDP.

Is it safe to open port 706?

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 706 is open?

On Linux run "ss -ltnup 'sport = :706'", on macOS "lsof -nP -i :706", and on Windows "netstat -ano | findstr :706" to see the local process. From another machine, "nmap -p 706 <host>" shows whether it is reachable.

05 Related
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