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Port 5253 (kpdp)

IANA assigns port 5253 to kpdp: Kohler Power Device Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kpdp TCP Kohler Power Device Protocol Bill Gross -

Registry dates for this port: registered 2010-11-01.

Check what is listening on port 5253

Linux: is anything listening on TCP 5253?
sudo ss -tlnp 'sport = :5253'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5253
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5253 '
Windows (Command Prompt)
netstat -ano | findstr :5253
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5253 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5253
From Windows
Test-NetConnection HOST -Port 5253

Block port 5253 in the firewall

ufw
sudo ufw deny 5253/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5253 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5253 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5253' -Direction Inbound -Protocol TCP -LocalPort 5253 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.