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Port 1340 (naap)

IANA assigns port 1340 to naap: NAAP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
naap TCP NAAP Henry Haverinen -
naap UDP NAAP Henry Haverinen -

Check what is listening on port 1340

Linux: is anything listening on TCP 1340?
sudo ss -tlnp 'sport = :1340'
Linux: UDP 1340
sudo ss -ulnp 'sport = :1340'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1340
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1340 '
Windows (Command Prompt)
netstat -ano | findstr :1340
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1340 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1340
From Windows
Test-NetConnection HOST -Port 1340
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1340

Block port 1340 in the firewall

ufw
sudo ufw deny 1340/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1340 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1340 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1340' -Direction Inbound -Protocol TCP -LocalPort 1340 -Action Block
ufw
sudo ufw deny 1340/udp
iptables
sudo iptables -A INPUT -p udp --dport 1340 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1340 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1340' -Direction Inbound -Protocol UDP -LocalPort 1340 -Action Block

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