Port 4556

dtn-bundle · DCCP/TCP/UDP

RangeRegistered port (1024–49151)
ProtocolDCCP/TCP/UDP
Servicedtn-bundle
ReferenceRFC 9174, RFC 7122
Registered2006-11
Modified2021-02-22

Frequently asked questions

What is port 4556 used for?

Port 4556 is registered with the IANA for dtn-bundle (DCCP/TCP/UDP). Description: DTN Bundle TCP CL Protocol; DTN Bundle UDP CL Protocol; DTN Bundle DCCP CL Protocol.

Is port 4556 a well-known port?

No. Port 4556 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4556 is open?

Locally on Linux with ss -tulpn | grep ':4556\b', on Windows with netstat -ano | findstr :4556. To test a remote host use Test-NetConnection <host> -Port 4556 in PowerShell or nc -zv <host> 4556 on Linux/macOS.

How do I open port 4556 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4556/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4556/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4556" -Direction Inbound -Protocol TCP -LocalPort 4556 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPdtn-bundleDTN Bundle TCP CL Protocol
UDPdtn-bundleDTN Bundle UDP CL Protocol
DCCPdtn-bundleDTN Bundle DCCP CL Protocol

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