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Port 36865 (kastenxpipe)

IANA assigns port 36865 to kastenxpipe: KastenX Pipe.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kastenxpipe TCP KastenX Pipe Guy Cheng -
kastenxpipe UDP KastenX Pipe Guy Cheng -

Check what is listening on port 36865

Linux: is anything listening on TCP 36865?
sudo ss -tlnp 'sport = :36865'
Linux: UDP 36865
sudo ss -ulnp 'sport = :36865'
Linux / macOS: which process owns the port
sudo lsof -nP -i :36865
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':36865 '
Windows (Command Prompt)
netstat -ano | findstr :36865
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 36865 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 36865
From Windows
Test-NetConnection HOST -Port 36865
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 36865

Block port 36865 in the firewall

ufw
sudo ufw deny 36865/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 36865 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 36865 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 36865' -Direction Inbound -Protocol TCP -LocalPort 36865 -Action Block
ufw
sudo ufw deny 36865/udp
iptables
sudo iptables -A INPUT -p udp --dport 36865 -j DROP
nftables
sudo nft add rule inet filter input udp dport 36865 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 36865' -Direction Inbound -Protocol UDP -LocalPort 36865 -Action Block

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