Port 8888 — HTTP alt
Quick reference for TCP/UDP port 8888, used by HTTP alt. Includes what the service does, security guidance and related ports.
What is port 8888?
HTTP alt; Jupyter notebooks default.
What port does HTTP alt use?
HTTP alt listens on port 8888 by default.
Is port 8888 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 8888
Test-NetConnection HOST -Port 8888
nmap -p 8888 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Medium risk — open with care
Port 8888 (HTTP alt) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 8888 used for?+
Port 8888 is the standard TCP/UDP port for HTTP alt. HTTP alt; Jupyter notebooks default.
What port does HTTP alt use?+
HTTP alt listens on port 8888 by default.
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