No ANY records found for 171.21.2.
Try 21.2 instead?
id 38262, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 171.21.2. IN ANY ;ANSWER ;AUTHORITY . 43163 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2025071802 1800 900 604800 86400 ;ADDITIONAL
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