HTTPfy

Port 9888 (cyborg-systems)

IANA assigns port 9888 to cyborg-systems: CYBORG Systems.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cyborg-systems TCP CYBORG Systems Malcolm Graham -
cyborg-systems UDP CYBORG Systems Malcolm Graham -

Check what is listening on port 9888

Linux: is anything listening on TCP 9888?
sudo ss -tlnp 'sport = :9888'
Linux: UDP 9888
sudo ss -ulnp 'sport = :9888'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9888
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9888 '
Windows (Command Prompt)
netstat -ano | findstr :9888
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9888 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9888
From Windows
Test-NetConnection HOST -Port 9888
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9888

Block port 9888 in the firewall

ufw
sudo ufw deny 9888/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9888 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9888 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9888' -Direction Inbound -Protocol TCP -LocalPort 9888 -Action Block
ufw
sudo ufw deny 9888/udp
iptables
sudo iptables -A INPUT -p udp --dport 9888 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9888 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9888' -Direction Inbound -Protocol UDP -LocalPort 9888 -Action Block

Related ports

9877x5109878kca-service9889gt-proxy9898monkeycom

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.