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Port 1685 (n2nremote)

IANA assigns port 1685 to n2nremote.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
n2nremote TCP n2nremote Kin Chan 2 -
n2nremote UDP n2nremote Kin Chan 2 -

Check what is listening on port 1685

Linux: is anything listening on TCP 1685?
sudo ss -tlnp 'sport = :1685'
Linux: UDP 1685
sudo ss -ulnp 'sport = :1685'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1685
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1685 '
Windows (Command Prompt)
netstat -ano | findstr :1685
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1685 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1685
From Windows
Test-NetConnection HOST -Port 1685
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1685

Block port 1685 in the firewall

ufw
sudo ufw deny 1685/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1685 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1685 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1685' -Direction Inbound -Protocol TCP -LocalPort 1685 -Action Block
ufw
sudo ufw deny 1685/udp
iptables
sudo iptables -A INPUT -p udp --dport 1685 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1685 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1685' -Direction Inbound -Protocol UDP -LocalPort 1685 -Action Block

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