Port 6121
spdy · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | spdy |
| Registered | 2010-04-26 |
Frequently asked questions
What is port 6121 used for?
Port 6121 is registered with the IANA for spdy (TCP/UDP). Description: SPDY for a faster web; Reserved.
Is port 6121 a well-known port?
No. Port 6121 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 6121 is open?
Locally on Linux with ss -tulpn | grep ':6121\b', on Windows with netstat -ano | findstr :6121. To test a remote host use Test-NetConnection <host> -Port 6121 in PowerShell or nc -zv <host> 6121 on Linux/macOS.
How do I open port 6121 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 6121/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=6121/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 6121" -Direction Inbound -Protocol TCP -LocalPort 6121 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | spdy | SPDY for a faster web |
| UDP | – | Reserved |