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// Other services

Port 6363: Named Data Networking

Port 6363 is assigned by IANA to ndn (Named Data Networking).

6363

How ndn works

Other services
client:6363ndnresponse client:6363ndnresponse

The client sends a request to port 6363 and the ndn service answers.

Transport
UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 6363 dangerous?

We have no specific security note for port 6363. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 6363

ServicePortTransportDescriptionReferenceUpdated
ndn 6363 UDP Named Data Networking - 2013-10-30
-6363-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6363, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6363'      # process listening on 6363
sudo lsof -nP -i :6363

macOS

sudo lsof -nP -i :6363

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6363 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6363
netstat -ano | findstr :6363

From another machine

nmap -p 6363 -sV <host>
sudo nmap -sU -p 6363 <host>
nc -zv <host> 6363

Block it in the firewall

sudo ufw deny 6363/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6363" -Direction Inbound -LocalPort 6363 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 6363 used for?

Port 6363 is assigned by IANA to ndn (Named Data Networking).

Is port 6363 TCP or UDP?

Port 6363 is registered for UDP.

Is it safe to open port 6363?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 6363 is open?

On Linux run "ss -ltnup 'sport = :6363'", on macOS "lsof -nP -i :6363", and on Windows "netstat -ano | findstr :6363" to see the local process. From another machine, "nmap -p 6363 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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