27018
MongoDB Shard Server
High RiskTCP — Database
Port Overview
Port Number
27018
Service Name
MongoDB Shard Server
Transport Protocol
TCP
Category
Database
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 27018?
Default port for MongoDB shard server processes (mongod in a sharded cluster). Used for internal cluster communication in MongoDB sharded deployments. Also used by some Steam game servers for multiplayer connectivity.
TCP
Database
Commonly Used
Security Considerations
Port 27018 (MongoDB Shard Server) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.