# NNS 
NNS - Neo Name Service is a service that allows manage a domain name as a digital asset (NFT). It has an interface similar to `DNS` but has significant differences in its internal structure.

## Entities:

- Domain
- Record
- Owner
- Committee

### Domain

Domain is string that satisfies the following requirements:
- Length from 2 to 255 characters.
- Root domain must start with a letter.
- All other fragments must start and end with a letter or digit.

Domain has owner, a registration period, and may optionally have records.

A fee established by the committee is charged upon domain registration. After registration, the owner can manage this asset (add/delete records, transfer ownership to another owner) until the end of the domain registration period.

### Record

A record is a pair of values `<type, string>`.

Supported record types:

| Type  | Description                               |
|-------|-------------------------------------------|
| A     | Represents address record type            |
| AAA   | Represents IPv6 address record type       |
| TXT   | Represents text record type               |
| CNAME | Represents canonical name record type     |
| SOA   | Represents start of authority record type |

### Owner

An owner is a wallet that has the right to manage this NFT (domain).

### Committee

The committee makes new tokens (domains), sets, and charges a fee for issuance.

## Globally Unique Domain Zone

For more information, see [here](../docs/globally-unique-domain-zone.md).