For use cases like this, I generally pull from: https://publicsuffix.org/list/effective_tld_names.dat https://publicsuffix.org/list/effective_tld_names.dat The

For use cases like this, I generally pull from: https://publicsuffix.org/list/effective_tld_names.dat https://publicsuffix.org/list/effective_tld_names.dat They'd consider these to be the .hk TLD's: .hk com.hk edu.hk gov.hk idv.hk net.hk org.hk 公司.hk 教育.hk 敎育.hk 政府.hk 個人.hk 个人.hk 箇人.hk 網络.hk 网络.hk 组織.hk 網絡.hk 网絡.hk 组织.hk 組織.hk They also consider dreamhost.com to be a TLD, so it's probably not the right list for some other use cases.