gcc.gnu.org. 30 IN TXT "v=spf1 a ip4:209.51.188.0/24 ip4:74.94.156.208/28 ip6:2001:470:142::/48 ?all" gcc.gnu.org. 30 IN A 8.43.85.97 gcc.gnu.org. 30 IN AAAA 2620:52:3:1:0:246e:9693:128c