No ANY records found for 186.1.31.15.
Try 1.31.15 instead?
id 50272, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 186.1.31.15. IN ANY ;ANSWER ;AUTHORITY . 86395 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024122600 1800 900 604800 86400 ;ADDITIONAL
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