Port 2221

ethernet-ip-s · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceethernet-ip-s
Modified2015-05-28

Frequently asked questions

What is port 2221 used for?

Port 2221 is registered with the IANA for ethernet-ip-s (TCP/UDP). Description: EtherNet/IP over TLS; EtherNet/IP over DTLS.

Is port 2221 a well-known port?

No. Port 2221 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 2221 is open?

Locally on Linux with ss -tulpn | grep ':2221\b', on Windows with netstat -ano | findstr :2221. To test a remote host use Test-NetConnection <host> -Port 2221 in PowerShell or nc -zv <host> 2221 on Linux/macOS.

How do I open port 2221 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 2221/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=2221/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 2221" -Direction Inbound -Protocol TCP -LocalPort 2221 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPethernet-ip-sEtherNet/IP over TLS
UDPethernet-ip-sEtherNet/IP over DTLS

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