Port 4889 (xcap-control)

IANA assigns port 4889 to xcap-control: xcap code analysis portal cluster control and administration.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

xcap-control TCP xcap code analysis portal cluster control and administration 88solutions Corporation -

Registry dates for this port: registered 2018-06-06.

Linux: is anything listening on TCP 4889?

sudo ss -tlnp 'sport = :4889'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4889

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4889 '

Windows (Command Prompt)

netstat -ano | findstr :4889

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4889 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4889

From Windows

Test-NetConnection HOST -Port 4889

ufw

sudo ufw deny 4889/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4889 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4889 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4889' -Direction Inbound -Protocol TCP -LocalPort 4889 -Action Block

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