Robtex

Up: 111.221.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 111.221.16.0/23
Down right: 111.221.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
111.221.16.67	PTR	po31-574.sin-6nf-2b.ntwk.msn.net
111.221.16.69	PTR	vlan574.sin-f6f-xit-1a.ntwk.msn.net
111.221.16.70	PTR	vlan574.sin-f6f-xit-1b.ntwk.msn.net
111.221.16.98	PTR	ten2-2-126.sin-6nf-2a.ntwk.msn.net
111.221.16.109	A+PTR	origin-sg.ds.microsoft.com
111.221.16.162	PTR	po31-132.sin-6nf-2a.ntwk.msn.net
111.221.16.163	PTR	po31-132.sin-6nf-2b.ntwk.msn.net
111.221.16.181	PTR	vlan356.sin-f8x-cis-4a.ntwk.msn.net
111.221.16.182	PTR	vlan356.sin-f8x-cis-4b.ntwk.msn.net
111.221.16.198	PTR	vlan577.sin-f6f-urs-1b.ntwk.msn.net
111.221.16.236	A	g.answers.ms.akadns.net
111.221.17.6	PTR	vlan170.sin-f8x-cis-4b.ntwk.msn.net
111.221.17.15	PTR	queue.sg1prodc.store.core.windows.net
111.221.17.47	PTR	queue.sg1prodd.store.core.windows.net
111.221.17.48	PTR	table.sg1prodd.store.core.windows.net
111.221.17.66	PTR	po31-133.sin-6nf-2a.ntwk.msn.net
111.221.17.86	PTR	mdsfe.mediaroomdemo.com
111.221.17.90	PTR	auth.mediaroomdemo.com
111.221.17.99	PTR	po31-580.sin-6nf-2b.ntwk.msn.net
111.221.17.105	PTR	p_crml_f_r_11~1.sin-f6x-1b.ntwk.msn.net
111.221.17.130	PTR	ae0-973.sin-96gmr-ucgmc-1a.ntwk.msn.net
111.221.17.131	PTR	ae0-973.sin-96gmr-ucgmc-1b.ntwk.msn.net
111.221.17.134	PTR	p_ucgmc_f_r_1~1.sin-f89-ucgmc-1b.ntwk.msn.net
111.221.17.138	A	mail-sg1.bigfish.com
111.221.17.142	PTR	sg10f00med03.infra.lync.com
111.221.17.150	A	mail-sg1.bigfish.com
111.221.17.165	PTR	p_bspos_f_r_1~1.sin-f89-bspos-1e.ntwk.msn.net
111.221.17.166	PTR	p_bspos_f_r_1~1.sin-f89-bspos-1f.ntwk.msn.net
111.221.17.170	A	7x5y.com
111.221.17.170	A	vonlifegroup.com
111.221.17.170	A	featurelabs.com
111.221.17.180	A	skestrata.com.au
111.221.17.183	A	pantac-china.com
111.221.17.199	A	outbound.officeapps.live.com
111.221.17.200	A	outbound.officeapps.live.com
111.221.17.201	A	outbound.officeapps.live.com
111.221.17.202	A	outbound.officeapps.live.com
111.221.17.219	A	outbound.officeapps.live.com
111.221.17.220	A+PTR	outbound.officeapps.live.com
111.221.17.221	A	outbound.officeapps.live.com
111.221.17.222	A	outbound.officeapps.live.com
111.221.18.10	PTR	msnbot-111-221-18-10.search.msn.com
111.221.18.20	A	msnbot-111-221-18-20.search.msn.com
111.221.18.21	PTR	msnbot-111-221-18-21.search.msn.com
111.221.18.24	A	msnbot-111-221-18-24.search.msn.com
111.221.18.33	A+PTR	msnbot-111-221-18-33.search.msn.com
111.221.18.35	A+PTR	msnbot-111-221-18-35.search.msn.com
111.221.18.36	A	msnbot-111-221-18-36.search.msn.com
111.221.18.38	PTR	msnbot-111-221-18-38.search.msn.com
111.221.18.40	PTR	msnbot-111-221-18-40.search.msn.com
111.221.18.49	PTR	msnbot-111-221-18-49.search.msn.com
111.221.18.51	A	msnbot-111-221-18-51.search.msn.com
111.221.18.66	PTR	port-channel1001-111.sin-x7x-msgr-1a.ntwk.msn.net
111.221.18.69	PTR	p_wns_f_r_111~1.sin-f89-wns-1a.ntwk.msn.net
111.221.18.80	A+PTR	sincd.wns.windows.com
111.221.18.83	A+PTR	sinab.wns.windows.com
111.221.18.98	PTR	po31-162.sin-6nf-2a.ntwk.msn.net
111.221.18.130	PTR	po31-620.sin-6nf-2a.ntwk.msn.net
111.221.18.134	PTR	p_wesp_f_r_11~1.sin-f6x-1b.ntwk.msn.net
111.221.18.152	A	main.sg.orws.microsoft.com.nsatc.net
111.221.18.153	A	main.sg.orws.microsoft.com.nsatc.net
111.221.18.155	A	main.sg.orws.microsoft.com.nsatc.net