Port 4739

ipfix · SCTP/TCP/UDP

RangeRegistered port (1024–49151)
ProtocolSCTP/TCP/UDP
Serviceipfix
Registered2005-08

Frequently asked questions

What is port 4739 used for?

Port 4739 is registered with the IANA for ipfix (SCTP/TCP/UDP). Description: IP Flow Info Export.

Is port 4739 a well-known port?

No. Port 4739 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4739 is open?

Locally on Linux with ss -tulpn | grep ':4739\b', on Windows with netstat -ano | findstr :4739. To test a remote host use Test-NetConnection <host> -Port 4739 in PowerShell or nc -zv <host> 4739 on Linux/macOS.

How do I open port 4739 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4739/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4739/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4739" -Direction Inbound -Protocol TCP -LocalPort 4739 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPipfixIP Flow Info Export
UDPipfixIP Flow Info Export
SCTPipfixIP Flow Info Export

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