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Port 3340 (anet-m)

IANA assigns port 3340 to anet-m: OMF data m.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
anet-m TCP OMF data m - -
anet-m UDP OMF data m - -

Check what is listening on port 3340

Linux: is anything listening on TCP 3340?
sudo ss -tlnp 'sport = :3340'
Linux: UDP 3340
sudo ss -ulnp 'sport = :3340'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3340
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3340 '
Windows (Command Prompt)
netstat -ano | findstr :3340
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3340 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3340
From Windows
Test-NetConnection HOST -Port 3340
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3340

Block port 3340 in the firewall

ufw
sudo ufw deny 3340/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3340 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3340 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3340' -Direction Inbound -Protocol TCP -LocalPort 3340 -Action Block
ufw
sudo ufw deny 3340/udp
iptables
sudo iptables -A INPUT -p udp --dport 3340 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3340 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3340' -Direction Inbound -Protocol UDP -LocalPort 3340 -Action Block

Related ports

3338anet-b3339anet-l3341anet-h3342webtie

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