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Port 1843 (netopia-vo5)

IANA assigns port 1843 to netopia-vo5.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netopia-vo5 TCP netopia-vo5 Marc Epard -
netopia-vo5 UDP netopia-vo5 Marc Epard -

Check what is listening on port 1843

Linux: is anything listening on TCP 1843?
sudo ss -tlnp 'sport = :1843'
Linux: UDP 1843
sudo ss -ulnp 'sport = :1843'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1843
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1843 '
Windows (Command Prompt)
netstat -ano | findstr :1843
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1843 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1843
From Windows
Test-NetConnection HOST -Port 1843
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1843

Block port 1843 in the firewall

ufw
sudo ufw deny 1843/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1843 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1843 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1843' -Direction Inbound -Protocol TCP -LocalPort 1843 -Action Block
ufw
sudo ufw deny 1843/udp
iptables
sudo iptables -A INPUT -p udp --dport 1843 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1843 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1843' -Direction Inbound -Protocol UDP -LocalPort 1843 -Action Block

Related ports

1841netopia-vo31842netopia-vo41844direcpc-dll1845altalink

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