ns2.indosat.com has no NS records.
NS records for this zone are defined at indosat.com.
NS records for this zone are defined at indosat.com.
Question and response
Question
dig ns2.indosat.com. NS
Answer
The response has no answer records.
Authority
indosat.com. 900 SOA external.auth-dns001-udc1. domain\.admin.indosat.com. 2011083796 3600 3600 1728000 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0