tejas-ems.summitgw.net has no CNAME records.
Question and response
Question
dig tejas-ems.summitgw.net. NS
Answer
The response has no answer records.
Authority
summitgw.net. 2935 SOA dns1.summitgw.net. admin.summitgw.net. 202412235 3600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0