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Port 8999 (bctp)

IANA assigns port 8999 to bctp: Brodos Crypto Trade Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bctp TCP Brodos Crypto Trade Protocol Alexander Sahler -
bctp UDP Brodos Crypto Trade Protocol Alexander Sahler -

Registry dates for this port: registered 2002-02.

Check what is listening on port 8999

Linux: is anything listening on TCP 8999?
sudo ss -tlnp 'sport = :8999'
Linux: UDP 8999
sudo ss -ulnp 'sport = :8999'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8999
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8999 '
Windows (Command Prompt)
netstat -ano | findstr :8999
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8999 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8999
From Windows
Test-NetConnection HOST -Port 8999
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8999

Block port 8999 in the firewall

ufw
sudo ufw deny 8999/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8999 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8999 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8999' -Direction Inbound -Protocol TCP -LocalPort 8999 -Action Block
ufw
sudo ufw deny 8999/udp
iptables
sudo iptables -A INPUT -p udp --dport 8999 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8999 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8999' -Direction Inbound -Protocol UDP -LocalPort 8999 -Action Block

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