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Port 376 (nip)

IANA assigns port 376 to nip: Amiga Envoy Network Inquiry Protocol.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nip TCP Amiga Envoy Network Inquiry Protocol Heinz Wrobel -
nip UDP Amiga Envoy Network Inquiry Protocol Heinz Wrobel -

Registry dates for this port: last modified 2020-10-02.

Check what is listening on port 376

Linux: is anything listening on TCP 376?
sudo ss -tlnp 'sport = :376'
Linux: UDP 376
sudo ss -ulnp 'sport = :376'
Linux / macOS: which process owns the port
sudo lsof -nP -i :376
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':376 '
Windows (Command Prompt)
netstat -ano | findstr :376
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 376 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 376
From Windows
Test-NetConnection HOST -Port 376
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 376

Block port 376 in the firewall

ufw
sudo ufw deny 376/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 376 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 376 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 376' -Direction Inbound -Protocol TCP -LocalPort 376 -Action Block
ufw
sudo ufw deny 376/udp
iptables
sudo iptables -A INPUT -p udp --dport 376 -j DROP
nftables
sudo nft add rule inet filter input udp dport 376 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 376' -Direction Inbound -Protocol UDP -LocalPort 376 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.