No ANY records found for 81.169.163.40.
Try 169.163.40 instead?
id 23541, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 81.169.163.40. IN ANY ;ANSWER ;AUTHORITY . 86398 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2025052102 1800 900 604800 86400 ;ADDITIONAL
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