ru1.userecho.ru has no NS records.
NS records for this zone are defined at userecho.ru.
NS records for this zone are defined at userecho.ru.
Question and response
Question
dig ru1.userecho.ru. NS
Answer
The response has no answer records.
Authority
userecho.ru. 600 SOA ns.ru1.userecho.ru. info.userecho.ru. 1257583654 300 360 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0