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Port 7551 (controlone-con)

IANA assigns port 7551 to controlone-con: ControlONE Console signaling.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
controlone-con TCP ControlONE Console signaling BYNE -

Registry dates for this port: registered 2014-11-07, last modified 2017-06-13.

Check what is listening on port 7551

Linux: is anything listening on TCP 7551?
sudo ss -tlnp 'sport = :7551'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7551
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7551 '
Windows (Command Prompt)
netstat -ano | findstr :7551
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7551 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7551
From Windows
Test-NetConnection HOST -Port 7551

Block port 7551 in the firewall

ufw
sudo ufw deny 7551/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7551 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7551 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7551' -Direction Inbound -Protocol TCP -LocalPort 7551 -Action Block

Related ports

7549nls-tl7550cloudsignaling7560sncp7563cfw

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