blue.cozahost.com has no NS records.
NS records for this zone are defined at cozahost.com.
NS records for this zone are defined at cozahost.com.
Question and response
Question
dig blue.cozahost.com. NS
Answer
The response has no answer records.
Authority
cozahost.com. 172800 SOA ns1.zelwe.com. tec.cozahost.com. 2015012003 14400 600 1209600 172800
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0