Robtex

Up: 64.4.48.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 64.4.48.128/26
Down right: 64.4.48.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.4.48.201	A+PTR	ns2-201.azure-dns.net
64.4.48.201	A	ns2prod.arpa-201.azuredns-prd.org
64.4.48.201	A	ns2prod.6403.azuredns-prd.org
64.4.48.202	A+PTR	ns2-202.azure-dns.net
64.4.48.203	A+PTR	ns2-203.azure-dns.net
64.4.48.204	A+PTR	ns2-204.azure-dns.net
64.4.48.205	PTR	ns2-205.azure-dns.net
64.4.48.205	A	ns2-205.botframework.com.msftnet.org
64.4.48.205	A	ns2-205.skype.com.msftnet.org
64.4.48.208	A+PTR	ns2-208.azure-dns.net
64.4.48.208	A	hensconsulting.com
64.4.48.208	A	nsp2.bdm.microsoftonline.com
64.4.48.221	A+PTR	ns2-221.azure-dns.net
64.4.48.221	A	ns2.sharepoint.com.msftnet.org
64.4.48.224	A+PTR	ns2-224.azure-dns.net
64.4.48.224	A	ns2prod.122.azuredns-prd.org
64.4.48.224	A	ns2prod.41087.azuredns-prd.org
64.4.48.225	A+PTR	ns2-225.azure-dns.net
64.4.48.225	A	ns2prod.24.azuredns-prd.org