How can someone verify the situation of some DNS inverse delegation?
LACNIC whois server gives this information when an IP block with DNS delegation is queried. This information will be at the “nsstat” and “nslastaa” fields of the whois response. “nsstat” indicates the delegation status. “nslastaa” indicates the last time a normal situation was observed. More details at: http://lacnic.net/en/lameness.
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