---
type: SNMP Concept
title: "The SNMP OID Tree: Numbering Hierarchy Explained"
description: "SNMP OID tree from 1.3.6.1 through mib-2 and enterprises, with group numbers and snmpwalk navigation."
resource: "https://snmp-monitoring.info/what-is-snmp/oid/tree/"
tags: [what-is-snmp]
timestamp: 2026-07-10T00:00:00Z
---

# The SNMP OID Tree: Numbering Hierarchy Explained

SNMP OID tree from 1.3.6.1 through mib-2 and enterprises, with group numbers and snmpwalk navigation.

## Related concepts

- Up: [What Is an OID in SNMP? Object Identifiers Explained](/what-is-snmp/oid/index.md)

## Frequently asked questions

### What is the root of the OID tree?

For practical SNMP, you almost always start from iso.org.dod.internet = 1.3.6.1, under the broader ISO/ITU registration tree beginning at iso(1).

### What is 1.3.6.1.2.1?

mib-2 (mgmt.mib-2)—the standard management subtree where system, interfaces, host, etc. live.

### What is under 1.3.6.1.4.1?

private.enterprises—vendor/organization branches keyed by Private Enterprise Numbers.

### How deep does the OID tree go?

As deep as definitions require; no single fixed depth. Instances add final arcs (.0 or table indexes).

## Source

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