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Port 37475 (neckar)

IANA assigns port 37475 to neckar: science + computing's Venus Administration Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
neckar TCP science + computing's Venus Administration Port Ralf Allrutz -
neckar UDP science + computing's Venus Administration Port Ralf Allrutz -

Registry dates for this port: registered 2002-02.

Check what is listening on port 37475

Linux: is anything listening on TCP 37475?
sudo ss -tlnp 'sport = :37475'
Linux: UDP 37475
sudo ss -ulnp 'sport = :37475'
Linux / macOS: which process owns the port
sudo lsof -nP -i :37475
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':37475 '
Windows (Command Prompt)
netstat -ano | findstr :37475
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 37475 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 37475
From Windows
Test-NetConnection HOST -Port 37475
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 37475

Block port 37475 in the firewall

ufw
sudo ufw deny 37475/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 37475 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 37475 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 37475' -Direction Inbound -Protocol TCP -LocalPort 37475 -Action Block
ufw
sudo ufw deny 37475/udp
iptables
sudo iptables -A INPUT -p udp --dport 37475 -j DROP
nftables
sudo nft add rule inet filter input udp dport 37475 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 37475' -Direction Inbound -Protocol UDP -LocalPort 37475 -Action Block

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