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Port 265 (x-bone-ctl)

IANA assigns port 265 to x-bone-ctl: X-Bone CTL.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
x-bone-ctl TCP X-Bone CTL Joe Touch -
x-bone-ctl UDP X-Bone CTL Joe Touch -

Check what is listening on port 265

Linux: is anything listening on TCP 265?
sudo ss -tlnp 'sport = :265'
Linux: UDP 265
sudo ss -ulnp 'sport = :265'
Linux / macOS: which process owns the port
sudo lsof -nP -i :265
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':265 '
Windows (Command Prompt)
netstat -ano | findstr :265
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 265 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 265
From Windows
Test-NetConnection HOST -Port 265
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 265

Block port 265 in the firewall

ufw
sudo ufw deny 265/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 265 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 265 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 265' -Direction Inbound -Protocol TCP -LocalPort 265 -Action Block
ufw
sudo ufw deny 265/udp
iptables
sudo iptables -A INPUT -p udp --dport 265 -j DROP
nftables
sudo nft add rule inet filter input udp dport 265 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 265' -Direction Inbound -Protocol UDP -LocalPort 265 -Action Block

Related ports

263hdap264bgmp266sst267td-service

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