No ANY records found for 221.73.91.
Try 73.91 instead?
id 31477, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 221.73.91. IN ANY ;ANSWER ;AUTHORITY . 86347 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024100600 1800 900 604800 86400 ;ADDITIONAL
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