Port 4333

ahsp · SCTP/TCP/UDP

RangeRegistered port (1024–49151)
ProtocolSCTP/TCP/UDP
Serviceahsp
Registered2014-04-10

Frequently asked questions

What is port 4333 used for?

Port 4333 is registered with the IANA for ahsp (SCTP/TCP/UDP). Description: ArrowHead Service Protocol (AHSP).

Is port 4333 a well-known port?

No. Port 4333 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4333 is open?

Locally on Linux with ss -tulpn | grep ':4333\b', on Windows with netstat -ano | findstr :4333. To test a remote host use Test-NetConnection <host> -Port 4333 in PowerShell or nc -zv <host> 4333 on Linux/macOS.

How do I open port 4333 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4333/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4333/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4333" -Direction Inbound -Protocol TCP -LocalPort 4333 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPahspArrowHead Service Protocol (AHSP)
UDPahspArrowHead Service Protocol (AHSP)
SCTPahspArrowHead Service Protocol (AHSP)

Nearby entries