9870
HDFS NameNode Web UI
High RiskTCP — Other
Port Overview
Port Number
9870
Service Name
HDFS NameNode Web UI
Transport Protocol
TCP
Category
Other
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 9870?
Port 9870 is the default web UI port for the Apache Hadoop HDFS NameNode in Hadoop 3.x. The NameNode web interface provides information about the HDFS cluster, including file system health, DataNode status, and block replication statistics. Earlier Hadoop versions used port 50070 for the same purpose.
TCP
Other
Security Considerations
Port 9870 (HDFS NameNode Web UI) 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.