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Port 378 (dsETOS)

IANA assigns port 378 to dsETOS: NEC Corporation.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
dsETOS TCP NEC Corporation Tomoo Fujita -
dsETOS UDP NEC Corporation Tomoo Fujita -

Check what is listening on port 378

Linux: is anything listening on TCP 378?
sudo ss -tlnp 'sport = :378'
Linux: UDP 378
sudo ss -ulnp 'sport = :378'
Linux / macOS: which process owns the port
sudo lsof -nP -i :378
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':378 '
Windows (Command Prompt)
netstat -ano | findstr :378
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 378 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 378
From Windows
Test-NetConnection HOST -Port 378
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 378

Block port 378 in the firewall

ufw
sudo ufw deny 378/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 378 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 378 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 378' -Direction Inbound -Protocol TCP -LocalPort 378 -Action Block
ufw
sudo ufw deny 378/udp
iptables
sudo iptables -A INPUT -p udp --dport 378 -j DROP
nftables
sudo nft add rule inet filter input udp dport 378 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 378' -Direction Inbound -Protocol UDP -LocalPort 378 -Action Block

Related ports

376nip377tnETOS379is99c380is99s

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