NFD » NDN Specifications

# ContentType

The following table defines the currently assigned values for the `ContentType` element in NDN Data packets.

ContentType  | Value (dec) | Description of the content | Reference

-------------|-------------|----------------------------|----------

Blob         |  0          | Payload identified by the data name; this is the default ContentType | [NDN packet spec](https://docs.named-data.net/NDN-packet-spec/current/data.html)

Link         |  1          | Another name which identifies the actual data content | [Link object](https://docs.named-data.net/NDN-packet-spec/current/link.html)

Key          |  2          | Public key; certificate | [Certificate](https://docs.named-data.net/NDN-packet-spec/current/certificate.html)

Nack         |  3          | Application-level NACK | [NDN packet spec](https://docs.named-data.net/NDN-packet-spec/current/data.html)

Manifest     |  4          | Manifest | #3301

PrefixAnnouncement |  5             | Prefix announcement object | [[nfd:PrefixAnnouncement]]

EncapsulatedData   |  6             | Encapsulated Data packet | Used by SVS-PS

SigningKey         |  9             | Unencrypted asymmetric private key | Used by NDNd

*(reserved)*       | 7-1023         | Reserved for future assignments

FLIC               |  1024          | File-Like ICN Collection (FLIC) | [draft-irtf-icnrg-flic](https://datatracker.ietf.org/doc/draft-irtf-icnrg-flic/)

*Experimentation range* | 9000-9999 | Reserved for experimentation |

## Experimentation range

TBD

## References

https://docs.named-data.net/NDN-packet-spec/current/data.html#contenttype