CyberHunter
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// Other services

Port 664: ASF Secure Remote Management and Control Protocol

Port 664 is assigned by IANA to asf-secure-rmcp (ASF Secure Remote Management and Control Protocol), oob-ws-https (DMTF out-of-band secure web services management protocol).

664

How asf-secure-rmcp works

Other services
client:664asf-secure-rmcpresponse client:664asf-secure-rmcpresponse

The client sends a request to port 664 and the asf-secure-rmcp service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 664 dangerous?

We have no specific security note for port 664. 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 664

ServicePortTransportDescriptionReferenceUpdated
asf-secure-rmcp 664 UDP ASF Secure Remote Management and Control Protocol - -
oob-ws-https 664 TCP DMTF out-of-band secure web services management protocol - 2007-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 664, and is it reachable?

Linux

sudo ss -ltnup 'sport = :664'      # process listening on 664
sudo lsof -nP -i :664

macOS

sudo lsof -nP -i :664

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 664 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 664
netstat -ano | findstr :664

From another machine

nmap -p 664 -sV <host>
sudo nmap -sU -p 664 <host>
nc -zv <host> 664

Block it in the firewall

sudo ufw deny 664/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 664" -Direction Inbound -LocalPort 664 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 664 used for?

Port 664 is assigned by IANA to asf-secure-rmcp (ASF Secure Remote Management and Control Protocol), oob-ws-https (DMTF out-of-band secure web services management protocol).

Is port 664 TCP or UDP?

Port 664 is registered for UDP and TCP.

Is it safe to open port 664?

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 664 is open?

On Linux run "ss -ltnup 'sport = :664'", on macOS "lsof -nP -i :664", and on Windows "netstat -ano | findstr :664" to see the local process. From another machine, "nmap -p 664 <host>" shows whether it is reachable.

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