spf11.gca.to has no NS records.
NS records for this zone are defined at gca.to.
NS records for this zone are defined at gca.to.
Question and response
Question
dig spf11.gca.to. NS
Answer
The response has no answer records.
Authority
gca.to. 3600 SOA ns-mail01.getcourse.ru. hostmaster.gca.to. 973499 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0