Robtex

Up: 41.221.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 41.221.40.0/22
Down right: 41.221.44.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
41.221.40.162	PTR	tie.go.tz
41.221.41.2	A+PTR	pop.simbanet.co.tz
41.221.41.2	A	mail.tata.co.tz
41.221.41.3	A+PTR	smtp1.simbanet.co.tz
41.221.41.4	A+PTR	mx1.simbanet.co.tz
41.221.41.5	A	relay.simbanet.co.tz
41.221.41.24	A+PTR	hotspot.backbone.co.tz
41.221.41.29	A+PTR	sip.backbone.co.tz
41.221.41.61	A+PTR	hs1.backbone.co.tz
41.221.41.61	PTR	mailscan.simbanet.co.tz
41.221.41.61	A	mail.nkwamira.org
41.221.41.100	A+PTR	dns1.simbanet.net
41.221.41.101	A+PTR	dn2.simbanet.net
41.221.41.114	PTR	web.simbanet.co.tz
41.221.41.168	A+PTR	relay.simbanet.co.tz
41.221.41.195	A	www.alibhais.com
41.221.42.58	A	mail.rldc.co.tz
41.221.43.203	PTR	kilimo.go.tz
41.221.45.62	PTR	mail.tanzaniteone.com
41.221.45.62	A	mail.tsavoriteone.com