24 July 2009 14:15
Google IP addresses - Google Apps Help
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dig txt _spf.google.com | grep spf
_spf.google.com. 300 IN TXT "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19
ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ?all"
1
(1 marks)