---
oid: "1.3.112.4.21"
asn1-notation: "{iso(1) identified-organization(3) standards-producing-organization(112) ccsds(4) 21}"
description: "Internet protocol extension header"
last-modified: "2026-04-08"
tags: [oid-repository]
---

## OID: `1.3.112.4.21` (last updated: 2026-04-08)

```asn1
{iso(1) identified-organization(3) standards-producing-organization(112) ccsds(4) 21}
```

### Description

Internet protocol extension header

**Classification**: Space data systems

### Supplementary information

Automatically extracted from the [Space Assigned Numbers Authority (SANA) Registry](https://www.sanaregistry.org/oid/1.3.112.4.21).

### Child OIDs

- `1.3.112.4.21.1`: `1`
- `1.3.112.4.21.2`: `2`
- `1.3.112.4.21.3`: `3`
- `1.3.112.4.21.4`: `4`
- `1.3.112.4.21.5`: `5`
- `1.3.112.4.21.6`: `6`
- `1.3.112.4.21.7`: `7`
- `1.3.112.4.21.8`: `8`
- `1.3.112.4.21.9`: `9`
- `1.3.112.4.21.10`: `10`
- `1.3.112.4.21.11`: `11`
- `1.3.112.4.21.12`: `12`

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