---
type: Sensor Reference
title: "SNMP Fan Speed (RPM) OIDs: ENTITY-SENSOR Reference"
description: "The SNMP OIDs for fan speed — rpm-typed entPhySensorValue from ENTITY-SENSOR-MIB, LM-SENSORS fan values on Linux, and vendor fan OIDs, with a snmpwalk example."
resource: "https://snmp-monitoring.info/sensors/fan-speed/"
tags: [sensors]
timestamp: 2026-07-11T00:00:00Z
---

# SNMP Fan Speed (RPM) OIDs: ENTITY-SENSOR Reference

The SNMP OIDs for fan speed — rpm-typed entPhySensorValue from ENTITY-SENSOR-MIB, LM-SENSORS fan values on Linux, and vendor fan OIDs, with a snmpwalk example.

## Related concepts

- Up: [SNMP Sensors & OID Catalog: Every Metric You Can Monitor](/sensors/index.md)

## Frequently asked questions

### What OID is fan speed in SNMP?

The portable one is entPhySensorValue (1.3.6.1.2.1.99.1.1.1.4) from the ENTITY-SENSOR-MIB, for any sensor whose entPhySensorType is rpm. On Linux with lm-sensors, lmFanSensorsValue (1.3.6.1.4.1.2021.13.16.3.1) works too; labelled per-fan data comes from vendor MIBs.

### What MIB has fan sensors?

The standard is the ENTITY-SENSOR-MIB at 1.3.6.1.2.1.99, which types sensors including rpm. Linux hosts also expose fans through the LM-SENSORS-MIB, and vendors publish labelled fan objects with health enums under their enterprise arc 1.3.6.1.4.1.

### What's the Linux fan speed OID?

On a Net-SNMP host with the lm-sensors module enabled, lmFanSensorsValue (1.3.6.1.4.1.2021.13.16.3.1) exposes the lm-sensors fan RPM values. It requires the module be configured in snmpd.conf, and the index-to-fan mapping is device-dependent, so confirm it on your hardware.

### What does 0 RPM mean?

On a non-variable fan, 0 RPM means the fan has failed or been removed — it's an unambiguous failure worth an immediate alert. First, though, check entPhySensorOperStatus: if the sensor reports unavailable rather than a real reading, that's a sensor/reporting issue, not necessarily a stopped fan.

## Source

Concept generated from https://snmp-monitoring.info/sensors/fan-speed/ — the SNMP Monitoring vendor-neutral knowledge base. Content is limited to what that page states (no external claims added here).