No ANY records found for 168.172.218.
Try 172.218 instead?
id 42628, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION 168.172.218. IN ANY ;ANSWER ;AUTHORITY . 86397 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2024122600 1800 900 604800 86400 ;ADDITIONAL
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