eu2.userecho.com has no NS records.
NS records for this zone are defined at userecho.com.
NS records for this zone are defined at userecho.com.
Question and response
Question
dig eu2.userecho.com. NS
Answer
The response has no answer records.
Authority
userecho.com. 600 SOA ns.us4.stamul.com. info.userecho.com. 1257588811 1200 300 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0