# Membership of the ccNSO is open for all ccTLD managers responsible for managing an ISO 3166 country-code top-level domain;<ref>[http://ccnso.icann.org/about CcNSO Membership]</ref> | # Membership of the ccNSO is open for all ccTLD managers responsible for managing an ISO 3166 country-code top-level domain;<ref>[http://ccnso.icann.org/about CcNSO Membership]</ref> |