Should port 9870 be open on my firewall?

Port 9870 should only be open with strict firewall rules whitelisting trusted IP addresses. Enable rate limiting and intrusion detection systems.

What transport protocol does port 9870 use?

Port 9870 (HDFS NameNode Web UI) uses the TCP transport protocol and falls under the Other category.

:9870 (TCP)

HDFS NameNode Web UI

Q: Is port 9870 (HDFS NameNode Web UI) dangerous?

Port 9870 is classified as high risk. It is a common target for automated scanning and brute-force attacks. Restrict access to trusted IPs if exposure is necessary.

High Risk

TCP — 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.

Related Ports — Other

35 Private Printer Server 43 WHOIS 63 Whois++ 75 Private Dial-Out Service 78 VetTCP 91 MIT-DOV 92 NPP 104 DICOM

Related Terms

ASN BGP Hijack Data Center Domain Name Dual Stack Internet Exchange Point (IXP)