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Port 356 (cloanto-net-1)

IANA assigns port 356 to cloanto-net-1: Cloanto Net 1.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
cloanto-net-1 TCP Cloanto Net 1 Michael Battilana -
cloanto-net-1 UDP Cloanto Net 1 Michael Battilana -

Registry dates for this port: registered 2010-04-30.

Check what is listening on port 356

Linux: is anything listening on TCP 356?
sudo ss -tlnp 'sport = :356'
Linux: UDP 356
sudo ss -ulnp 'sport = :356'
Linux / macOS: which process owns the port
sudo lsof -nP -i :356
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':356 '
Windows (Command Prompt)
netstat -ano | findstr :356
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 356 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 356
From Windows
Test-NetConnection HOST -Port 356
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 356

Block port 356 in the firewall

ufw
sudo ufw deny 356/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 356 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 356 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 356' -Direction Inbound -Protocol TCP -LocalPort 356 -Action Block
ufw
sudo ufw deny 356/udp
iptables
sudo iptables -A INPUT -p udp --dport 356 -j DROP
nftables
sudo nft add rule inet filter input udp dport 356 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 356' -Direction Inbound -Protocol UDP -LocalPort 356 -Action Block

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