- Bind the service to localhost or a private network, never to a public address.
- Enable authentication, use per-application accounts and require TLS.
- Watch for exposed Docker ports: publish them on 127.0.0.1 only.
Port 6640: Open vSwitch Database protocol
Port 6640 is assigned by IANA to ovsdb (Open vSwitch Database protocol).
6640
How ovsdb works
Databases & cachesThe application sends a SQL query to the ovsdb server on port 6640, which returns rows from its tables.
- Transport
- TCP
- 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
- Databases & caches
Is port 6640 dangerous?
We have no specific security note for port 6640. Its risk depends on the program actually listening on it. General advice for databases & caches services:
IANA registry entries for port 6640
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| ovsdb | 6640 | TCP | Open vSwitch Database protocol | RFC 7047 | 2013-07-31 |
| - | 6640 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 6640, and is it reachable?
Linux
sudo ss -ltnup 'sport = :6640' # process listening on 6640
sudo lsof -nP -i :6640macOS
sudo lsof -nP -i :6640
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6640 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 6640 netstat -ano | findstr :6640
From another machine
nmap -p 6640 -sV <host> nc -zv <host> 6640
Block it in the firewall
sudo ufw deny 6640/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 6640" -Direction Inbound -LocalPort 6640 -Protocol TCP -Action Block # Windows
What is port 6640 used for?
Port 6640 is assigned by IANA to ovsdb (Open vSwitch Database protocol).
Is port 6640 TCP or UDP?
Port 6640 is registered for TCP.
Is it safe to open port 6640?
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. Bind the service to localhost or a private network, never to a public address.
How do I check if port 6640 is open?
On Linux run "ss -ltnup 'sport = :6640'", on macOS "lsof -nP -i :6640", and on Windows "netstat -ano | findstr :6640" to see the local process. From another machine, "nmap -p 6640 <host>" shows whether it is reachable.
Other databases & caches ports
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk