No ANY records found for 231.108.175.
Try 108.175 instead?
id 37513, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 231.108.175. IN ANY ;ANSWER ;AUTHORITY . 86390 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024092900 1800 900 604800 86400 ;ADDITIONAL
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