CyberHunter
Local dataset, no network
// Other services

Port 566: streettalk

Port 566 is assigned by IANA to streettalk (streettalk).

566

How streettalk works

Other services
client:566streettalkresponse client:566streettalkresponse

The client sends a request to port 566 and the streettalk 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 566 dangerous?

We have no specific security note for port 566. 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 566

ServicePortTransportDescriptionReferenceUpdated
streettalk 566 TCP, UDP streettalk - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 566, and is it reachable?

Linux

sudo ss -ltnup 'sport = :566'      # process listening on 566
sudo lsof -nP -i :566

macOS

sudo lsof -nP -i :566

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 566 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 566
netstat -ano | findstr :566

From another machine

nmap -p 566 -sV <host>
sudo nmap -sU -p 566 <host>
nc -zv <host> 566

Block it in the firewall

sudo ufw deny 566/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 566" -Direction Inbound -LocalPort 566 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 566 used for?

Port 566 is assigned by IANA to streettalk (streettalk).

Is port 566 TCP or UDP?

Port 566 is registered for TCP and UDP.

Is it safe to open port 566?

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 566 is open?

On Linux run "ss -ltnup 'sport = :566'", on macOS "lsof -nP -i :566", and on Windows "netstat -ano | findstr :566" to see the local process. From another machine, "nmap -p 566 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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