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Port 1676 (netcomm1, netcomm2)

IANA assigns port 1676 to netcomm1, netcomm2: netcomm1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netcomm1 TCP netcomm1 - -
netcomm2 UDP netcomm2 Bulent Kasman -

Check what is listening on port 1676

Linux: is anything listening on TCP 1676?
sudo ss -tlnp 'sport = :1676'
Linux: UDP 1676
sudo ss -ulnp 'sport = :1676'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1676
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1676 '
Windows (Command Prompt)
netstat -ano | findstr :1676
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1676 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1676
From Windows
Test-NetConnection HOST -Port 1676
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1676

Block port 1676 in the firewall

ufw
sudo ufw deny 1676/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1676 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1676 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1676' -Direction Inbound -Protocol TCP -LocalPort 1676 -Action Block
ufw
sudo ufw deny 1676/udp
iptables
sudo iptables -A INPUT -p udp --dport 1676 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1676 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1676' -Direction Inbound -Protocol UDP -LocalPort 1676 -Action Block

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