No ANY records found for 171.21.204.
Try 21.204 instead?
id 62572, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 171.21.204. IN ANY ;ANSWER ;AUTHORITY . 86375 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024122500 1800 900 604800 86400 ;ADDITIONAL
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