No ANY records found for 20.53.168.
Try 53.168 instead?
id 47782, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 20.53.168. IN ANY ;ANSWER ;AUTHORITY . 86391 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024122900 1800 900 604800 86400 ;ADDITIONAL
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