DNS/oarc.net/txt/8.8.8.8について、ここに記述してください。
$ dig rs.dns-oarc.net txt @8.8.8.8 ; <<>> DiG 9.11.1 <<>> rs.dns-oarc.net txt @8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41256 ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;rs.dns-oarc.net. IN TXT ;; ANSWER SECTION: rs.dns-oarc.net. 59 IN CNAME rst.x4090.rs.dns-oarc.net. rst.x4090.rs.dns-oarc.net. 58 IN CNAME rst.x4058.x4090.rs.dns-oarc.net. rst.x4058.x4090.rs.dns-oarc.net. 57 IN CNAME rst.x4064.x4058.x4090.rs.dns-oarc.net. rst.x4064.x4058.x4090.rs.dns-oarc.net. 56 IN TXT "173.194.93.12 DNS reply size limit is at least 4090" rst.x4064.x4058.x4090.rs.dns-oarc.net. 56 IN TXT "173.194.93.12 sent EDNS buffer size 4096" rst.x4064.x4058.x4090.rs.dns-oarc.net. 56 IN TXT "Tested at 2017-07-14 07:06:55 UTC" ;; Query time: 1410 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Fri Jul 14 16:06:55 JST 2017 ;; MSG SIZE rcvd: 279