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Port 1984 (bb)

IANA assigns port 1984 to bb: BB.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bb TCP BB Sean MacGuire -
bb UDP BB Sean MacGuire -

Check what is listening on port 1984

Linux: is anything listening on TCP 1984?
sudo ss -tlnp 'sport = :1984'
Linux: UDP 1984
sudo ss -ulnp 'sport = :1984'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1984
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1984 '
Windows (Command Prompt)
netstat -ano | findstr :1984
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1984 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1984
From Windows
Test-NetConnection HOST -Port 1984
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1984

Block port 1984 in the firewall

ufw
sudo ufw deny 1984/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1984 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1984 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1984' -Direction Inbound -Protocol TCP -LocalPort 1984 -Action Block
ufw
sudo ufw deny 1984/udp
iptables
sudo iptables -A INPUT -p udp --dport 1984 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1984 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1984' -Direction Inbound -Protocol UDP -LocalPort 1984 -Action Block

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