Two of Google’s IPs do resolve from some sources, but not from others: 74.125.82.46 and 74.125.82.54 resolve to mail-wm0-f46.google.com <http://mail-wm0-f46.google.com/> and mail-wm0-f54.google.com <http://mail-wm0-f54.google.com/>, but those two names only resolve back to the IPs from some places. The status is NXDOMAIN, not some REFUSED/SERVFAIL.
From server 1: matthias@trillian:~$ dig -t any mail-wg0-f46.google.com ; <<>> DiG 9.8.1-P1 <<>> -t any mail-wg0-f46.google.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 16768 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;mail-wg0-f46.google.com. IN ANY ;; AUTHORITY SECTION: google.com. 42 IN SOA ns3.google.com. dns-admin.google.com. 107500025 900 900 1800 60 ;; Query time: 0 msec ;; SERVER: 2001:8a8:4806::178#53(2001:8a8:4806::178) ;; WHEN: Tue Nov 10 20:45:41 2015 ;; MSG SIZE rcvd: 91 From server 2 (where it did not work a couple of days previously): root@db ~ # dig -t any mail-wm0-f46.google.com ; <<>> DiG 9.9.5-3-Ubuntu <<>> -t any mail-wm0-f46.google.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63472 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;mail-wm0-f46.google.com. IN ANY ;; ANSWER SECTION: mail-wm0-f46.google.com. 86299 IN A 74.125.82.46 ;; AUTHORITY SECTION: google.com. 132863 IN NS ns1.google.com. google.com. 132863 IN NS ns3.google.com. google.com. 132863 IN NS ns2.google.com. google.com. 132863 IN NS ns4.google.com. ;; ADDITIONAL SECTION: ns1.google.com. 134452 IN A 216.239.32.10 ns2.google.com. 134452 IN A 216.239.34.10 ns3.google.com. 134452 IN A 216.239.36.10 ns4.google.com. 134452 IN A 216.239.38.10 ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Tue Nov 10 20:45:40 CET 2015 ;; MSG SIZE rcvd: 204 Anybody else noticing inconsistencies? Note: Even though I noticed this on dnswl.org <http://dnswl.org/> servers, the behaviour seems to be erratic also on completely non-dnswl.org <http://non-dnswl.org/>-related machines. — Matthias
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