> For the complete documentation index, see [llms.txt](https://docs.klaytn.domains/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.klaytn.domains/english/domain/domain.md).

# .kaia Domains

The '.kaia' TLD (top-level domain) is owned by a smart contract, and any domain using the .kaia TLD such as 'kns.kaia' can be registered without permission.

The domains are available for registration on a yearly basis, and the registration fee differs by length. The pricing can be found on the [Registration Fee](/english/domain/price.md) page.

Domains must consist of roman alphabet small letters or numbers within 3 to 255 letters. This is a measure to prevent IDN homograph attacks (an attack that exploits users by using similar-looking letters and confusing them).