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Port 28010 (gruber-cashreg)

IANA assigns port 28010 to gruber-cashreg: Gruber cash registry protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gruber-cashreg TCP Gruber cash registry protocol Gruber Schanksysteme -

Registry dates for this port: registered 2019-12-31.

Check what is listening on port 28010

Linux: is anything listening on TCP 28010?
sudo ss -tlnp 'sport = :28010'
Linux / macOS: which process owns the port
sudo lsof -nP -i :28010
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':28010 '
Windows (Command Prompt)
netstat -ano | findstr :28010
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 28010 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 28010
From Windows
Test-NetConnection HOST -Port 28010

Block port 28010 in the firewall

ufw
sudo ufw deny 28010/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 28010 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 28010 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 28010' -Direction Inbound -Protocol TCP -LocalPort 28010 -Action Block

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28000nxlmd28001pqsp28080thor-engine28119a27-ran-ran

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.