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Port 2911 (blockade)

IANA assigns port 2911 to blockade: Blockade.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
blockade TCP Blockade Blockade -
blockade UDP Blockade Blockade -

Check what is listening on port 2911

Linux: is anything listening on TCP 2911?
sudo ss -tlnp 'sport = :2911'
Linux: UDP 2911
sudo ss -ulnp 'sport = :2911'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2911
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2911 '
Windows (Command Prompt)
netstat -ano | findstr :2911
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2911 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2911
From Windows
Test-NetConnection HOST -Port 2911
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2911

Block port 2911 in the firewall

ufw
sudo ufw deny 2911/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2911 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2911 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2911' -Direction Inbound -Protocol TCP -LocalPort 2911 -Action Block
ufw
sudo ufw deny 2911/udp
iptables
sudo iptables -A INPUT -p udp --dport 2911 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2911 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2911' -Direction Inbound -Protocol UDP -LocalPort 2911 -Action Block

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