ns4.indosat.com has no CNAME records.
Question and response
Question
dig ns4.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 1232, xrcode 0, version 0, flags 0