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Port 11201 (smsqp)

IANA assigns port 11201 to smsqp.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
smsqp TCP smsqp Andres Seco Hernande -
smsqp UDP smsqp Andres Seco Hernande -

Check what is listening on port 11201

Linux: is anything listening on TCP 11201?
sudo ss -tlnp 'sport = :11201'
Linux: UDP 11201
sudo ss -ulnp 'sport = :11201'
Linux / macOS: which process owns the port
sudo lsof -nP -i :11201
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':11201 '
Windows (Command Prompt)
netstat -ano | findstr :11201
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 11201 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 11201
From Windows
Test-NetConnection HOST -Port 11201
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 11201

Block port 11201 in the firewall

ufw
sudo ufw deny 11201/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 11201 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 11201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 11201' -Direction Inbound -Protocol TCP -LocalPort 11201 -Action Block
ufw
sudo ufw deny 11201/udp
iptables
sudo iptables -A INPUT -p udp --dport 11201 -j DROP
nftables
sudo nft add rule inet filter input udp dport 11201 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 11201' -Direction Inbound -Protocol UDP -LocalPort 11201 -Action Block

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