spf.salesforce.com CNAME records

CNAME Canonical name
3m 40s
spf.salesforce.com has no CNAME records.

Question and response

Question

dig spf.salesforce.com. NS

Answer

The response has no answer records.

Authority

salesforce.com. 220 SOA mastername.salesforce.com. hostmaster.salesforce.com. 2016652834 600 900 2592000 1800

Additional

. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0