Robtex

Up: 111.221.76.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 111.221.76.0/25
Down right: 111.221.76.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
111.221.76.60	A+PTR	msuc05dr.manage.microsoft.com
111.221.76.60	A	portal.msuc05.manage.microsoft.com
111.221.76.60	A	msuc05.manage.microsoft.com
111.221.76.158	PTR	sippoolhkn0f03.infra.lync.com
111.221.76.164	A	exap.um.outlook.com