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Port 28119 (a27-ran-ran)

IANA assigns port 28119 to a27-ran-ran: A27 cdma2000 RAN Management.

Registered (user) port, 1024-49151 UDP

Port 28119 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
a27-ran-ran UDP A27 cdma2000 RAN Management 3GPP 2 -

Registry dates for this port: registered 2012-04-13.

Check what is listening on port 28119

Linux: UDP 28119
sudo ss -ulnp 'sport = :28119'
Linux / macOS: which process owns the port
sudo lsof -nP -i :28119
Windows (Command Prompt)
netstat -ano | findstr :28119
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 28119

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 28119

Block port 28119 in the firewall

ufw
sudo ufw deny 28119/udp
iptables
sudo iptables -A INPUT -p udp --dport 28119 -j DROP
nftables
sudo nft add rule inet filter input udp dport 28119 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 28119' -Direction Inbound -Protocol UDP -LocalPort 28119 -Action Block

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