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DNS Lame Delegations Report 2019-11

http://dnsinstitute.com/research/lame-servers-201911/

The following examples were seen in November 2019. Some of the problems have been resolved, but a few still exist. 

== サーバーがない ==
NSレコードがない場合もある。(clientHold状態など)

 * No address for delegated NS target (A / AAAA がない)
 * NS target recursively points to itself or parent
 * Non-existent server  (間違い名など NXDOMAIN)

== 返事がない/不正 ==
 * Nameserver refuses to answer
 * Nameserver returns a non-authoritative answer
 * Nameserver returns a failure SERVFAIL or FORMERR