rain.psg.com has no CNAME records.
Question and response
Question
dig rain.psg.com. NS
Answer
The response has no answer records.
Authority
psg.com. 2212 SOA rip.psg.com. hostmaster.psg.com. 1772737422 86400 3600 2592000 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0