Port 4888 (xcap-portal)

IANA assigns port 4888 to xcap-portal: xcap code analysis portal public user access.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

xcap-portal TCP xcap code analysis portal public user access 88solutions Corporation -

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

Linux: is anything listening on TCP 4888?

sudo ss -tlnp 'sport = :4888'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4888

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4888 '

Windows (Command Prompt)

netstat -ano | findstr :4888

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4888 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4888

From Windows

Test-NetConnection HOST -Port 4888

ufw

sudo ufw deny 4888/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4888 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4888 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4888' -Direction Inbound -Protocol TCP -LocalPort 4888 -Action Block

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