I did some googling:Conquest Inc. wrote:What does this mean?
28 3896 0.26% 858 0.15% 2918 0.02% Old style Arpanet (arpa)
and is it unusual?
The Internet Architecture Board (IAB), in cooperation with the
Internet Corporation for Assigned Names and Numbers (ICANN), is
currently responsible for managing the Top Level Domain (TLD) name
"arpa". This arrangement is documented in Appendix A. This domain
name provides the root of the name hierarchy of the reverse mapping
of IP addresses to domain names. More generally, this domain name
undertakes a role as a limited use domain for Internet
infrastructure applications, by providing a name root for the mapping
of particular protocol values to names of service entities. This
domain name provides a name root for the mapping of protocol values
into lookup keys to retrieve operationally critical protocol
infrastructure data records or objects for the Internet.
But I still don't get it.