HTTPfy

Port 1842 (netopia-vo4)

IANA assigns port 1842 to netopia-vo4.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netopia-vo4 TCP netopia-vo4 - -
netopia-vo4 UDP netopia-vo4 - -

Check what is listening on port 1842

Linux: is anything listening on TCP 1842?
sudo ss -tlnp 'sport = :1842'
Linux: UDP 1842
sudo ss -ulnp 'sport = :1842'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1842
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1842 '
Windows (Command Prompt)
netstat -ano | findstr :1842
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1842 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1842
From Windows
Test-NetConnection HOST -Port 1842
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1842

Block port 1842 in the firewall

ufw
sudo ufw deny 1842/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1842 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1842 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1842' -Direction Inbound -Protocol TCP -LocalPort 1842 -Action Block
ufw
sudo ufw deny 1842/udp
iptables
sudo iptables -A INPUT -p udp --dport 1842 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1842 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1842' -Direction Inbound -Protocol UDP -LocalPort 1842 -Action Block

Related ports

1840netopia-vo21841netopia-vo31843netopia-vo51844direcpc-dll

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