8888
Jupyter Notebook and JupyterLab interactive computing environment
Jupyter Notebook / JupyterLab
What is port 8888?
Port 8888 is the default for Jupyter Notebook and JupyterLab — the popular interactive computing environment for Python, R, and Julia, widely used in data science and machine learning. An exposed Jupyter instance without authentication grants full Remote Code Execution on the server — an attacker can run any command as the server user. Numerous cryptomining incidents have originated from exposed Jupyter servers. Always require a password/token and access through a VPN or SSH tunnel.
Quick checks
$
nc -zv example.com 8888
$
nmap -p 8888 example.com
$
telnet example.com 8888