CyberHunter
Local dataset, no network
// Other services

Port 669: MeRegister

Port 669 is assigned by IANA to meregister (MeRegister).

669

How meregister works

Other services
client:669meregisterresponse client:669meregisterresponse

The client sends a request to port 669 and the meregister 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 669 dangerous?

We have no specific security note for port 669. 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 669

ServicePortTransportDescriptionReferenceUpdated
meregister 669 TCP, UDP MeRegister - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 669, and is it reachable?

Linux

sudo ss -ltnup 'sport = :669'      # process listening on 669
sudo lsof -nP -i :669

macOS

sudo lsof -nP -i :669

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 669 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 669
netstat -ano | findstr :669

From another machine

nmap -p 669 -sV <host>
sudo nmap -sU -p 669 <host>
nc -zv <host> 669

Block it in the firewall

sudo ufw deny 669/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 669" -Direction Inbound -LocalPort 669 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 669 used for?

Port 669 is assigned by IANA to meregister (MeRegister).

Is port 669 TCP or UDP?

Port 669 is registered for TCP and UDP.

Is it safe to open port 669?

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 669 is open?

On Linux run "ss -ltnup 'sport = :669'", on macOS "lsof -nP -i :669", and on Windows "netstat -ano | findstr :669" to see the local process. From another machine, "nmap -p 669 <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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