Port 4646

dots-signal · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicedots-signal
ReferenceRFC 8973, RFC 9132
Registered2020-01-16
Modified2021-06-14

Frequently asked questions

What is port 4646 used for?

Port 4646 is registered with the IANA for dots-signal (TCP/UDP). Description: Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Protocol. The service name is used to construct the SRV service names "_dots-signal._udp" and "_dots-signal._tcp" for discovering DOTS servers used to establish DOTS signal channel..

Is port 4646 a well-known port?

No. Port 4646 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4646 is open?

Locally on Linux with ss -tulpn | grep ':4646\b', on Windows with netstat -ano | findstr :4646. To test a remote host use Test-NetConnection <host> -Port 4646 in PowerShell or nc -zv <host> 4646 on Linux/macOS.

How do I open port 4646 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4646/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4646/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4646" -Direction Inbound -Protocol TCP -LocalPort 4646 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPdots-signalDistributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Protocol. The service name is used to construct the SRV service names "_dots-signal._udp" and "_dots-signal._tcp" for discovering DOTS servers used to establish DOTS signal channel.
UDPdots-signalDistributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Protocol. The service name is used to construct the SRV service names "_dots-signal._udp" and "_dots-signal._tcp" for discovering DOTS servers used to establish DOTS signal channel.

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