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Port 3341 (anet-h)

IANA assigns port 3341 to anet-h: OMF data h.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
anet-h TCP OMF data h Per Sahlqvist -
anet-h UDP OMF data h Per Sahlqvist -

Check what is listening on port 3341

Linux: is anything listening on TCP 3341?
sudo ss -tlnp 'sport = :3341'
Linux: UDP 3341
sudo ss -ulnp 'sport = :3341'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3341
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3341 '
Windows (Command Prompt)
netstat -ano | findstr :3341
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3341 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3341
From Windows
Test-NetConnection HOST -Port 3341
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3341

Block port 3341 in the firewall

ufw
sudo ufw deny 3341/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3341 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3341 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3341' -Direction Inbound -Protocol TCP -LocalPort 3341 -Action Block
ufw
sudo ufw deny 3341/udp
iptables
sudo iptables -A INPUT -p udp --dport 3341 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3341 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3341' -Direction Inbound -Protocol UDP -LocalPort 3341 -Action Block

Related ports

3339anet-l3340anet-m3342webtie3343ms-cluster-net

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