com to expedia.com: The following NS name(s) were found in the authoritative NS RRset, but not in the delegation NS RRset (i.e., in the com zone): pdns2.ultradns.net, pdns1.ultradns.net
com to expedia.com: The following NS name(s) were found in the delegation NS RRset (i.e., in the com zone), but not in the authoritative NS RRset: pdns89.ultradns.com, pdns89.ultradns.net