CyberHunter
Local dataset, no network
// Other services

Port 5728: Dist. I/O Comm. Service Data and Control

Port 5728 is assigned by IANA to io-dist-data (Dist. I/O Comm. Service Data and Control), io-dist-group (Dist. I/O Comm. Service Group Membership).

5728

How io-dist-data works

Other services
client:5728io-dist-dataresponse client:5728io-dist-dataresponse

The client sends a request to port 5728 and the io-dist-data service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 5728 dangerous?

We have no specific security note for port 5728. 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 5728

ServicePortTransportDescriptionReferenceUpdated
io-dist-data 5728 TCP Dist. I/O Comm. Service Data and Control - 2010-03-22
io-dist-group 5728 UDP Dist. I/O Comm. Service Group Membership - 2010-03-22

// source: IANA service name and port number registry

03 Check it

Which program uses port 5728, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5728'      # process listening on 5728
sudo lsof -nP -i :5728

macOS

sudo lsof -nP -i :5728

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5728 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5728
netstat -ano | findstr :5728

From another machine

nmap -p 5728 -sV <host>
sudo nmap -sU -p 5728 <host>
nc -zv <host> 5728

Block it in the firewall

sudo ufw deny 5728/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5728" -Direction Inbound -LocalPort 5728 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5728 used for?

Port 5728 is assigned by IANA to io-dist-data (Dist. I/O Comm. Service Data and Control), io-dist-group (Dist. I/O Comm. Service Group Membership).

Is port 5728 TCP or UDP?

Port 5728 is registered for TCP and UDP.

Is it safe to open port 5728?

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 5728 is open?

On Linux run "ss -ltnup 'sport = :5728'", on macOS "lsof -nP -i :5728", and on Windows "netstat -ano | findstr :5728" to see the local process. From another machine, "nmap -p 5728 <host>" shows whether it is reachable.

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