Port 4121

e-builder · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicee-builder
Registered2006-12

Frequently asked questions

What is port 4121 used for?

Port 4121 is registered with the IANA for e-builder (TCP/UDP). Description: e-Builder Application Communication.

Is port 4121 a well-known port?

No. Port 4121 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4121 is open?

Locally on Linux with ss -tulpn | grep ':4121\b', on Windows with netstat -ano | findstr :4121. To test a remote host use Test-NetConnection <host> -Port 4121 in PowerShell or nc -zv <host> 4121 on Linux/macOS.

How do I open port 4121 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4121/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4121/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4121" -Direction Inbound -Protocol TCP -LocalPort 4121 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPe-buildere-Builder Application Communication
UDPe-buildere-Builder Application Communication

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