Robtex

Up: 41.73.236.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 41.73.237.0/25
Down right: 41.73.237.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
41.73.237.6	PTR	exchsvr.bttechltd.com
41.73.237.6	A+PTR	remote.bttechltd.com
41.73.237.6	A	exchange.bttechltd.com
41.73.237.21	PTR	mail.hb-ng.com
41.73.237.21	A	mail-server.hbnig.com
41.73.237.21	A	mail.bf-ng.com