But notice that their infrastructure servers do have reverse DNS. I don't know that I really have an ask here, other than an observation that it's nice when DNS works; and when it doesn't it's not that difficult to synthesize PTR records from observed traffic. (Further editorializing deleted.)
-- Fred Morris -- # dig cloudflare-dns.com ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35599 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 7 ;; QUESTION SECTION: ;cloudflare-dns.com. IN A ;; ANSWER SECTION: cloudflare-dns.com. 82 IN A 104.16.248.249 cloudflare-dns.com. 82 IN A 104.16.249.249 ;; AUTHORITY SECTION: cloudflare-dns.com. 171975 IN NS ns2.cloudflare-dns.com. cloudflare-dns.com. 171975 IN NS ns1.cloudflare-dns.com. cloudflare-dns.com. 171975 IN NS ns3.cloudflare-dns.com. ;; ADDITIONAL SECTION: ns1.cloudflare-dns.com. 171975 IN A 162.159.0.33 ns2.cloudflare-dns.com. 171975 IN A 162.159.1.33 ns3.cloudflare-dns.com. 171975 IN A 162.159.2.9 ns1.cloudflare-dns.com. 171975 IN AAAA 2400:cb00:2049:1::a29f:21 ns2.cloudflare-dns.com. 171975 IN AAAA 2400:cb00:2049:1::a29f:121 ns3.cloudflare-dns.com. 171975 IN AAAA 2400:cb00:2049:1::a29f:209 # dig -x 104.16.248.249 ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 60630 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;249.248.16.104.in-addr.arpa. IN PTR ;; AUTHORITY SECTION: 16.104.in-addr.arpa. 3600 IN SOA cruz.ns.cloudflare.com. dns.cloudflare.com. 2288625500 10000 2400 604800 3600 # dig mozilla.cloudflare-dns.com ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56983 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 7 ;; QUESTION SECTION: ;mozilla.cloudflare-dns.com. IN A ;; ANSWER SECTION: mozilla.cloudflare-dns.com. 300 IN A 172.64.41.4 mozilla.cloudflare-dns.com. 300 IN A 162.159.61.4 ;; AUTHORITY SECTION: mozilla.cloudflare-dns.com. 299 IN NS dorthy.ns.cloudflare.com. mozilla.cloudflare-dns.com. 299 IN NS terin.ns.cloudflare.com. ;; ADDITIONAL SECTION: terin.ns.cloudflare.com. 85645 IN A 108.162.193.236 terin.ns.cloudflare.com. 85645 IN A 172.64.33.236 terin.ns.cloudflare.com. 85645 IN A 173.245.59.236 dorthy.ns.cloudflare.com. 85645 IN A 108.162.192.249 dorthy.ns.cloudflare.com. 85645 IN A 172.64.32.249 dorthy.ns.cloudflare.com. 85645 IN A 173.245.58.249 # dig -x 172.64.41.4 ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 27383 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;4.41.64.172.in-addr.arpa. IN PTR ;; AUTHORITY SECTION: 64.172.in-addr.arpa. 2948 IN SOA cruz.ns.cloudflare.com. dns.cloudflare.com. 2280027582 10000 2400 604800 3600 # dig -x 162.159.0.33 ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7716 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 7 ;; QUESTION SECTION: ;33.0.159.162.in-addr.arpa. IN PTR ;; ANSWER SECTION: 33.0.159.162.in-addr.arpa. 1800 IN PTR ns3.cloudflare.com. # dig cruz.ns.cloudflare.com ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41140 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 5, ADDITIONAL: 21 ;; QUESTION SECTION: ;cruz.ns.cloudflare.com. IN A ;; ANSWER SECTION: cruz.ns.cloudflare.com. 86353 IN A 172.64.32.88 cruz.ns.cloudflare.com. 86353 IN A 108.162.192.88 cruz.ns.cloudflare.com. 86353 IN A 173.245.58.88 # dig -x 172.64.32.88 ; <<>> DiG 9.12.3-P1 <<>> -x 172.64.32.88 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31715 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 10 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1280 ; COOKIE: 44c3fd36426feb1af0830e666509ca1431cd55e8888dcc1f (good) ;; QUESTION SECTION: ;88.32.64.172.in-addr.arpa. IN PTR ;; ANSWER SECTION: 88.32.64.172.in-addr.arpa. 1800 IN PTR cruz.ns.cloudflare.com. ;; AUTHORITY SECTION: 64.172.in-addr.arpa. 1374 IN NS cruz.ns.cloudflare.com. 64.172.in-addr.arpa. 1374 IN NS kevin.ns.cloudflare.com. # dig one.one.one.one ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4317 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 7 ;; QUESTION SECTION: ;one.one.one.one. IN A ;; ANSWER SECTION: one.one.one.one. 300 IN A 1.0.0.1 one.one.one.one. 300 IN A 1.1.1.1 ;; AUTHORITY SECTION: one.one.one. 2067 IN NS terin.ns.cloudflare.com. one.one.one. 2067 IN NS dorthy.ns.cloudflare.com. # dig -x 1.0.0.1 ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33563 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 9 ;; QUESTION SECTION: ;1.0.0.1.in-addr.arpa. IN PTR ;; ANSWER SECTION: 1.0.0.1.in-addr.arpa. 1800 IN PTR one.one.one.one. ;; AUTHORITY SECTION: 0.0.1.in-addr.arpa. 86400 IN NS ns3.cloudflare.com. 0.0.1.in-addr.arpa. 86400 IN NS ns7.cloudflare.com.
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