A domain level top, warranty (sTLD) is one of the categories of top level domains (TLD) that by (IANA) for use in the domain name system on the internet is maintained.

a domain level above the guaranteed level domain the top of the special is a representative of the community specific services, it warranties.

these associations are based on ethnicity, geographical region, etc. specialized ... being technical or other subject, proposed formed by private dealers or organizations that task the creation and implementation of rules limiting the competence registrar to use the top level domain are managed. For example, domain level top .aero by the company SITA warranties. who recorded it for members of the aviation industry has limited.