Question and response
Question
dig spf.21vianet.com. TXT
Answer
spf.21vianet.com. 600 TXT "v=spf1 ip4:59.151.19.91/25 ip4:106.120.80.109/28 ip4:180.168.35.64/27 ip4:120.133.224.75/32 ip4:120.133.224.67/32 -all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0