Port 27017 — MongoDB
Quick reference for TCP/UDP port 27017, used by MongoDB. Includes what the service does, security guidance and related ports.
What is port 27017?
MongoDB default.
What port does MongoDB use?
MongoDB listens on port 27017 by default.
Is port 27017 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 27017
Test-NetConnection HOST -Port 27017
nmap -p 27017 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
High risk — do not expose to the internet
Port 27017 (MongoDB) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 27017 used for?+
Port 27017 is the standard TCP/UDP port for MongoDB. MongoDB default.
What port does MongoDB use?+
MongoDB listens on port 27017 by default.
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