Pitinan and Dennis were right and I was wrong. In the definition of IDNA, the term "LDH Label" include both "true" ASCII LDH labels and A-labels. "True" ASCII LDH labels are called "NON-RESERVED LDH Labels" or NR-LDH labels for short. https://tools.ietf.org/html/rfc5890#section-2.3.1 Mats --- Mats Dufberg mats.dufberg@internetstiftelsen.se Technical Expert Internetstiftelsen (The Swedish Internet Foundation) Mobile: +46 73 065 3899 https://internetstiftelsen.se/