HTTPfy

Port 6841 (netmo-default)

IANA assigns port 6841 to netmo-default: Netmo Default.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netmo-default TCP Netmo Default Urs Bertschinger -
netmo-default UDP Netmo Default Urs Bertschinger -

Check what is listening on port 6841

Linux: is anything listening on TCP 6841?
sudo ss -tlnp 'sport = :6841'
Linux: UDP 6841
sudo ss -ulnp 'sport = :6841'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6841
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6841 '
Windows (Command Prompt)
netstat -ano | findstr :6841
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6841 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6841
From Windows
Test-NetConnection HOST -Port 6841
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6841

Block port 6841 in the firewall

ufw
sudo ufw deny 6841/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6841 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6841 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6841' -Direction Inbound -Protocol TCP -LocalPort 6841 -Action Block
ufw
sudo ufw deny 6841/udp
iptables
sudo iptables -A INPUT -p udp --dport 6841 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6841 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6841' -Direction Inbound -Protocol UDP -LocalPort 6841 -Action Block

Related ports

6817pentbox-sim6831ambit-lm6842netmo-http6850iccrushmore

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