---
id: "eui64"
kind: "datatype"
status: "draft"
is_pii: true
categories: ["internet", "identifiers"]
langs: ["common"]
quality: 80
url: "http://registry.apicrafter.io/datatype/eui64"
---

# EUI-64 identifier (`eui64`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

64-bit Extended Unique Identifier of the IEEE: an OUI or a longer company identifier followed by an extension that the organization assigns. IEEE 802.15.4 networks such as Zigbee and Thread, FireWire and InfiniBand use it as a hardware address, and IPv6 can derive interface identifiers from it. It is written as eight pairs of hexadecimal digits separated by hyphens or colons; a MAC address (EUI-48) has six pairs and is described by mac_address. RFC 9542 reserves 00-00-5E-EF-10-00-00-00 to 00-00-5E-EF-10-00-00-FF for documentation.

- Personal data (PII): yes
- Categories: Internet (internet), Universal unique identifiers (identifiers)
- Countries: global
- Languages: Common to most languages (common)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^(?:[0-9A-Fa-f]{2}(?:-[0-9A-Fa-f]{2}){7}|[0-9A-Fa-f]{2}(?::[0-9A-Fa-f]{2}){7})$
```

## Examples

- `00-00-5E-EF-10-00-00-01` — Documentation value of RFC 9542
- `00:00:5e:ef:10:00:00:ff` — Documentation value of RFC 9542 with colons
- `00-00-5E-FF-FE-00-53-01` — EUI-48-derived documentation value of RFC 9542
- `00-00-5E-00-53-01` (invalid example) — Six octets: a MAC address (EUI-48)
- `00-00-5E-EF-10-00-00` (invalid example) — Seven octets

## Translations

- ru: Идентификатор EUI-64: 64-битный расширенный уникальный идентификатор IEEE: восемь пар шестнадцатеричных цифр.

## Sources

- wikipedia: <https://en.wikipedia.org/wiki/MAC_address>
- doc: <https://www.rfc-editor.org/rfc/rfc9542>
- doc: <https://standards.ieee.org/wp-content/uploads/import/documents/tutorials/eui.pdf>

## Quality

Score 80/100. Missing: mapping (Wikidata, Schema.org, ...), detector coverage.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/eui64.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/internet/eui64.yaml>