1. _spf.google.com

2. whois

_spf.google.com.        222     IN      TXT     "v=spf1 
include:_netblocks.google.com 
include:_netblocks2.google.com 
include:_netblocks3.google.com ~all"

3. history

_netblocks.google.com.  103     IN      TXT     "v=spf1 
ip4:35.190.247.0/24 
ip4:64.233.160.0/19 
ip4:66.102.0.0/20 
ip4:66.249.80.0/20 
ip4:72.14.192.0/18 
ip4:74.125.0.0/16 
ip4:108.177.8.0/21 
ip4:173.194.0.0/16 
ip4:209.85.128.0/17 
ip4:216.58.192.0/19 
ip4:216.239.32.0/19 ~all"

_netblocks2.google.com. 300     IN      TXT     "v=spf1 ip6:2001:4860:4000::/36 ip6:2404:6800:4000::/36 ip6:2607:f8b0:4000::/36 ip6:2800:3f0:4000::/36 ip6:2a00:1450:4000::/36 ip6:2c0f:fb50:4000::/36 ~all"

_netblocks3.google.com. 300     IN      TXT     "v=spf1 
ip4:172.217.0.0/19 ip4:172.217.32.0/20 
ip4:172.217.128.0/19 
ip4:172.217.160.0/20 
ip4:172.217.192.0/19 
ip4:172.253.56.0/21 
ip4:172.253.112.0/20 
ip4:108.177.96.0/19 
ip4:35.191.0.0/16 
ip4:130.211.0.0/22 ~all"

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