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// Other services

Port 28010: Gruber cash registry protocol

Port 28010 is assigned by IANA to gruber-cashreg (Gruber cash registry protocol).

28010

How gruber-cashreg works

Other services
client:28010gruber-cashregresponse client:28010gruber-cashregresponse

The client sends a request to port 28010 and the gruber-cashreg service answers.

Transport
TCP
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 28010 dangerous?

We have no specific security note for port 28010. 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 28010

ServicePortTransportDescriptionReferenceUpdated
gruber-cashreg 28010 TCP Gruber cash registry protocol - 2019-12-31
-28010-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 28010, and is it reachable?

Linux

sudo ss -ltnup 'sport = :28010'      # process listening on 28010
sudo lsof -nP -i :28010

macOS

sudo lsof -nP -i :28010

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 28010 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 28010
netstat -ano | findstr :28010

From another machine

nmap -p 28010 -sV <host>
nc -zv <host> 28010

Block it in the firewall

sudo ufw deny 28010/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 28010" -Direction Inbound -LocalPort 28010 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 28010 used for?

Port 28010 is assigned by IANA to gruber-cashreg (Gruber cash registry protocol).

Is port 28010 TCP or UDP?

Port 28010 is registered for TCP.

Is it safe to open port 28010?

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 28010 is open?

On Linux run "ss -ltnup 'sport = :28010'", on macOS "lsof -nP -i :28010", and on Windows "netstat -ano | findstr :28010" to see the local process. From another machine, "nmap -p 28010 <host>" shows whether it is reachable.

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