Port 12121

nupaper-ss · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicenupaper-ss
Registered2005-11

Frequently asked questions

What is port 12121 used for?

Port 12121 is registered with the IANA for nupaper-ss (TCP/UDP). Description: NuPaper Session Service.

Is port 12121 a well-known port?

No. Port 12121 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 12121 is open?

Locally on Linux with ss -tulpn | grep ':12121\b', on Windows with netstat -ano | findstr :12121. To test a remote host use Test-NetConnection <host> -Port 12121 in PowerShell or nc -zv <host> 12121 on Linux/macOS.

How do I open port 12121 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 12121/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=12121/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 12121" -Direction Inbound -Protocol TCP -LocalPort 12121 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPnupaper-ssNuPaper Session Service
UDPnupaper-ssNuPaper Session Service

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