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Port 16001 (fmsascon)

IANA assigns port 16001 to fmsascon: Administration Server Connector.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fmsascon TCP Administration Server Connector Mark Davidson -

Registry dates for this port: registered 2010-10-06.

Check what is listening on port 16001

Linux: is anything listening on TCP 16001?
sudo ss -tlnp 'sport = :16001'
Linux / macOS: which process owns the port
sudo lsof -nP -i :16001
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':16001 '
Windows (Command Prompt)
netstat -ano | findstr :16001
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 16001 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 16001
From Windows
Test-NetConnection HOST -Port 16001

Block port 16001 in the firewall

ufw
sudo ufw deny 16001/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 16001 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 16001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 16001' -Direction Inbound -Protocol TCP -LocalPort 16001 -Action Block

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