Port 48049 (3gpp-cbsp)

IANA assigns port 48049 to 3gpp-cbsp: 3GPP Cell Broadcast Service Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

3gpp-cbsp TCP 3GPP Cell Broadcast Service Protocol Gert Thomasen -

Registry dates for this port: registered 2009-12-07.

Linux: is anything listening on TCP 48049?

sudo ss -tlnp 'sport = :48049'

Linux / macOS: which process owns the port

sudo lsof -nP -i :48049

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':48049 '

Windows (Command Prompt)

netstat -ano | findstr :48049

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 48049 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 48049

From Windows

Test-NetConnection HOST -Port 48049

ufw

sudo ufw deny 48049/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 48049 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 48049 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 48049' -Direction Inbound -Protocol TCP -LocalPort 48049 -Action Block

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