Port 4190
sieve · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | sieve |
| Reference | RFC 5804 |
Frequently asked questions
What is port 4190 used for?
Port 4190 is registered with the IANA for sieve (TCP/UDP). Description: ManageSieve Protocol; Reserved.
Is port 4190 a well-known port?
No. Port 4190 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 4190 is open?
Locally on Linux with ss -tulpn | grep ':4190\b', on Windows with netstat -ano | findstr :4190. To test a remote host use Test-NetConnection <host> -Port 4190 in PowerShell or nc -zv <host> 4190 on Linux/macOS.
How do I open port 4190 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 4190/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4190/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4190" -Direction Inbound -Protocol TCP -LocalPort 4190 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | sieve | ManageSieve Protocol |
| UDP | – | Reserved |