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19.4.64.in-addr.arpa is a domain controlled by five nameservers at msft.net. All of them are on different IP networks. msn.com, iis.net, live.com, msft.net, webtv.net and at least 23 other hosts share nameservers with this domain.

19.4.64.in-addr.arpa
ns-soa records
ns1.msft.net
+ 65.55.37.62 65.55.32.0/20 AS8075 -
+ --- -
ns records
ns1.msft.net
+ 65.55.37.62 65.55.32.0/20 AS8075 -
+ --- -
ns2.msft.net
+ 64.4.59.173 64.4.0.0/18 AS8075 -
ns3.msft.net
+ 213.199.161.77 213.199.160.0/20 AS8068 dns3uk.msft.net
+ --- dns3uk.msft.net
+ --- -
+ --- dns3.uk.msft.net
ns4.msft.net
+ 207.46.75.254 207.46.64.0/19 AS8069 -
+ --- -
ns5.msft.net
+ 65.55.226.140 65.55.192.0/18 AS8075 -
nameservers used by this domain
ns1.msft.net
ns2.msft.net
ns3.msft.net
ns4.msft.net
ns5.msft.net
domains sharing nameservers
00001001.ch
2007partnersalestool.com
aa-autoroute.com
autoprof.com
bay0.hotmail.com
bay6.hotmail.com
caligari.com
dynamicsonline.com
hotmail.com
hotmail.com.br
hotmail.jp
hotmail.msn.com
hotmail.net
hotmail.se
iis.net
live.com
microsoft-window.com
microsoft.com
msft.net
msn.com
msnbcbusiness.com
msnbcenespanol.com
msnbcsports.com
msnhotmail.com
office.com
updates-microsoft.com
webtv.net
windowsvistachallenge.com
ip numbers of nameservers
207.46.75.254
213.199.161.77
64.4.59.173
65.55.226.140
65.55.37.62
reverse names of the nameservers
dns3.uk.msft.net
dns3uk.msft.net
ns1.msft.net
ns2.msft.net
ns3.msft.net
ns4.msft.net
ns5.msft.net
other names of the nameservers
dns3.jp.msft.net
dns3.uk.msft.net
dns3uk.msft.net
dns4.jp.msft.net
domains sharing nameservers under another name
brandtsavage.com
encarta.at
hotmail.bb
linkscountryclub.net
matureadvantageauto.com
microsoft.co.jp
microsoft.ee
money-central.co.jp
moneycentral.co.jp
msn.hu
nwtraders.com
passport.com
rcdesktop.com
wwte22.com