No ANY records found for 251.128.129.
Try 128.129 instead?
id 38412, opcode QUERY, rcode NOTIMP, flags QR RD RA ;QUESTION 251.128.129. IN ANY ;ANSWER ;AUTHORITY ;ADDITIONAL
whatsmydns.net ANY Record Lookup tool lets you query DNS servers and get instant results.
Looking for easier to understand results? Use the Global DNS Checker tool.