Underscore is not a valid character in a hostname. See RFC 952 and RFC 1123 which combined define what is legal in a hostname. Note: SRV, TLSA etc. use underscore in the prefix labels because it is *not* a valid hostname character. This is done so that the labels used with these records cannot clash with valid hostnames. Mark In message , "Igor via RT" writes: > > Tue Jul 04 21:55:33 2017: Request 45507 was acted upon. > Transaction: Ticket created by big-town@yandex.ru > Queue: bind9-confidential > Subject: BIND 9.8.1-P1 - It is not recognized a hostname content "_" > Owner: Nobody > Requestors: big-town@yandex.ru > Status: new > Ticket > ----------------------------------------------------------------------- > > Bug Report from www.isc.org: > > Name: Igor > Email: big-town@yandex.ru > Software Version: BIND 9.8.1-P1 > OS: Ubuntu 14.04 > Subject:It is not recognized a hostname content "_" > > > Bug Detail > =========== > It is not recognized a hostname content "_". > > Jul 5 00:45:17 dhcp82 named[514]: /etc/bind/db.rpz.zone:14018: nizhni_novgorod.intimatlas.in.rpz.zone: bad owner name (check > -names) > > --- > This email was received through isc.org Bug Submission Form > > > -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org