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// Directory & authentication

Port 6670: Vocaltec Global Online Directory

Port 6670 is assigned by IANA to vocaltec-gold (Vocaltec Global Online Directory).

6670

How vocaltec-gold works

Directory & authentication
userdirectoryvocaltec-goldresponse userdirectoryvocaltec-goldresponse

The client proves who it is on port 6670 and gets an answer (or a ticket) it can use with other services.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Directory & authentication
01 Security

Is port 6670 dangerous?

We have no specific security note for port 6670. Its risk depends on the program actually listening on it. General advice for directory & authentication services:

  • Keep directory and authentication services on internal networks.
  • Require signing or TLS and disable anonymous queries.
  • Monitor authentication failures for spraying and brute force.
02 Registry

IANA registry entries for port 6670

ServicePortTransportDescriptionReferenceUpdated
vocaltec-gold 6670 TCP, UDP Vocaltec Global Online Directory - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6670, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6670'      # process listening on 6670
sudo lsof -nP -i :6670

macOS

sudo lsof -nP -i :6670

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6670 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6670
netstat -ano | findstr :6670

From another machine

nmap -p 6670 -sV <host>
sudo nmap -sU -p 6670 <host>
nc -zv <host> 6670

Block it in the firewall

sudo ufw deny 6670/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6670" -Direction Inbound -LocalPort 6670 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6670 used for?

Port 6670 is assigned by IANA to vocaltec-gold (Vocaltec Global Online Directory).

Is port 6670 TCP or UDP?

Port 6670 is registered for TCP and UDP.

Is it safe to open port 6670?

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. Keep directory and authentication services on internal networks.

How do I check if port 6670 is open?

On Linux run "ss -ltnup 'sport = :6670'", on macOS "lsof -nP -i :6670", and on Windows "netstat -ano | findstr :6670" to see the local process. From another machine, "nmap -p 6670 <host>" shows whether it is reachable.

05 Related
:389 LDAP tcp · udp · high risk :636 LDAPS tcp · udp · moderate risk :88 Kerberos tcp · udp · high risk :3268 Global Catalog (LDAP) tcp · udp · high risk :1812 RADIUS udp · tcp · moderate risk :31 MSG Authentication tcp · udp :49 Login Host Protocol (TACACS) tcp · udp :56 XNS Authentication tcp · udp

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