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Port 3380 (sns-channels)

IANA assigns port 3380 to sns-channels: SNS Channels.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sns-channels TCP SNS Channels Shekar Pasumarthi -
sns-channels UDP SNS Channels Shekar Pasumarthi -

Check what is listening on port 3380

Linux: is anything listening on TCP 3380?
sudo ss -tlnp 'sport = :3380'
Linux: UDP 3380
sudo ss -ulnp 'sport = :3380'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3380
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3380 '
Windows (Command Prompt)
netstat -ano | findstr :3380
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3380 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3380
From Windows
Test-NetConnection HOST -Port 3380
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3380

Block port 3380 in the firewall

ufw
sudo ufw deny 3380/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3380 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3380 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3380' -Direction Inbound -Protocol TCP -LocalPort 3380 -Action Block
ufw
sudo ufw deny 3380/udp
iptables
sudo iptables -A INPUT -p udp --dport 3380 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3380 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3380' -Direction Inbound -Protocol UDP -LocalPort 3380 -Action Block

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