---
oid: "1"
asn1-notation: "{iso(1)}"
description: "International Organization for Standardization (ISO)"
last-modified: "2025-10-02"
tags: [oid-repository]
---

## OID: `1`

```asn1
{iso(1)}
```

### Description

International Organization for Standardization (ISO)

**Classification**: Standards development organization (SDO)

### Supplementary information

This OID is for ISO or IEC International Standards, and ISO Member Bodies.
Operation of this OID is in accordance with [Rec. ITU-T X.660 \| ISO/IEC 9834-1](https://itu.int/ITU-T/X.660) "Procedures for the operation of object identifier registration authorities: General procedures and top arcs of the international object identifier tree".
All decisions related to child OIDs will be recorded as amendments to Rec. ITU-T X.660 \| ISO/IEC 9834-1 (such changes to the common text will be regarded as editorial by ITU-T).
From Rec. ITU-T X.660 (2004) \| ISO/IEC 9834-1:2004, "the top-level arcs are restricted to three arcs numbered `0` to `2`; and the arcs beneath root arcs `0` and `1` are restricted to forty arcs numbered `0` to `39`." This enables optimized encodings to be used in which the values of the top two arcs for all arcs under top-level arcs `0` and `1` encode in a single octet in an object identifier encoding (see the Rec. ITU-T X.690 series \| ISO/IEC 8825 multi-part Standard).

### Child OIDs

- [OID `1.0`](https://oid-base.com/get-md/1.0): `standard(0)`
- [OID `1.1`](https://oid-base.com/get-md/1.1): `registration-authority(1)`
- [OID `1.2`](https://oid-base.com/get-md/1.2): `member-body(2)`
- [OID `1.3`](https://oid-base.com/get-md/1.3): `identified-organization(3)`

This is a [frozen OID](https://oid-base.com/faq.htm#leaf) (no more child OIDs can be added to the existing ones).

### Terms of Use
[Terms of use](https://oid-base.com/disclaimer.htm.md)