No ANY records found for 171.2.72.
Try 2.72 instead?
id 21602, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 171.2.72. IN ANY ;ANSWER ;AUTHORITY . 86393 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024122501 1800 900 604800 86400 ;ADDITIONAL
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