No ANY records found for 21.5.253.
Try 5.253 instead?
id 34539, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 21.5.253. IN ANY ;ANSWER ;AUTHORITY . 86256 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024122201 1800 900 604800 86400 ;ADDITIONAL
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