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Port 1201 (nucleus-sand)

IANA assigns port 1201 to nucleus-sand: Nucleus Sand Database Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nucleus-sand TCP Nucleus Sand Database Server James Marsh -
nucleus-sand UDP Nucleus Sand Database Server James Marsh -

Check what is listening on port 1201

Linux: is anything listening on TCP 1201?
sudo ss -tlnp 'sport = :1201'
Linux: UDP 1201
sudo ss -ulnp 'sport = :1201'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1201
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1201 '
Windows (Command Prompt)
netstat -ano | findstr :1201
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1201 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1201
From Windows
Test-NetConnection HOST -Port 1201
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1201

Block port 1201 in the firewall

ufw
sudo ufw deny 1201/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1201 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1201' -Direction Inbound -Protocol TCP -LocalPort 1201 -Action Block
ufw
sudo ufw deny 1201/udp
iptables
sudo iptables -A INPUT -p udp --dport 1201 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1201' -Direction Inbound -Protocol UDP -LocalPort 1201 -Action Block

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