Port 802

mbap-s · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Servicembap-s
Registered2014-06-10

Frequently asked questions

What is port 802 used for?

Port 802 is registered with the IANA for mbap-s (TCP/UDP). Description: Modbus Application Protocol Secure.

Is port 802 a well-known port?

Yes. Port 802 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.

How do I check whether port 802 is open?

Locally on Linux with ss -tulpn | grep ':802\b', on Windows with netstat -ano | findstr :802. To test a remote host use Test-NetConnection <host> -Port 802 in PowerShell or nc -zv <host> 802 on Linux/macOS.

How do I open port 802 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 802/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=802/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 802" -Direction Inbound -Protocol TCP -LocalPort 802 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPmbap-sModbus Application Protocol Secure
UDPmbap-sModbus Application Protocol Secure

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