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// Other services

Port 5021: zenginkyo-2

Port 5021 is assigned by IANA to zenginkyo-2 (zenginkyo-2).

5021

How zenginkyo-2 works

Other services
client:5021zenginkyo-2response client:5021zenginkyo-2response

The client sends a request to port 5021 and the zenginkyo-2 service answers.

Transport
TCP · 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 5021 dangerous?

We have no specific security note for port 5021. 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 5021

ServicePortTransportDescriptionReferenceUpdated
zenginkyo-2 5021 TCP, UDP zenginkyo-2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5021, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5021'      # process listening on 5021
sudo lsof -nP -i :5021

macOS

sudo lsof -nP -i :5021

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5021 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5021
netstat -ano | findstr :5021

From another machine

nmap -p 5021 -sV <host>
sudo nmap -sU -p 5021 <host>
nc -zv <host> 5021

Block it in the firewall

sudo ufw deny 5021/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5021" -Direction Inbound -LocalPort 5021 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5021 used for?

Port 5021 is assigned by IANA to zenginkyo-2 (zenginkyo-2).

Is port 5021 TCP or UDP?

Port 5021 is registered for TCP and UDP.

Is it safe to open port 5021?

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 5021 is open?

On Linux run "ss -ltnup 'sport = :5021'", on macOS "lsof -nP -i :5021", and on Windows "netstat -ano | findstr :5021" to see the local process. From another machine, "nmap -p 5021 <host>" shows whether it is reachable.

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