Robtex

Up: 50.20.30.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 50.20.30.0/25
Down right: 50.20.30.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
50.20.30.7	A+PTR	slb01bay-v11.nrcrgaby.cbeyond.net
50.20.30.9	A+PTR	omx.cbeyond.com
50.20.30.10	A+PTR	omx.cbeyond.com
50.20.30.11	A+PTR	mts.cbeyond.com
50.20.30.15	A+PTR	smtp.cbeyond.com
50.20.30.15	A	smtp.zytron.net
50.20.30.17	PTR	mail.cbeyond.com
50.20.30.17	A	mail.hou.cbeyond.com
50.20.30.17	A	mail.homewardboundvet.com
50.20.30.18	A+PTR	mail.east.cbeyond.com
50.20.30.18	A	mail.masterpiecelighting.com
50.20.30.19	A+PTR	mail.west.cbeyond.com
50.20.30.19	A	pop3.zytron.net
50.20.30.19	A	mail.epicvb.com
50.20.30.21	PTR	mx1.cbeyond.com
50.20.30.21	A	mxbak.rodeoplasticbag.com
50.20.30.21	A	mail.libertyautoplaza.com
50.20.30.23	A+PTR	autodiscover.cbeyondonline.net
50.20.30.24	A	mail.konjacpa.com
50.20.30.24	A	mail.christy.com
50.20.30.24	A	mail.martinowhite.com
50.20.30.25	A	exchange.cbeyondonline.net
50.20.30.25	A	sync.cbeyondonline.net
50.20.30.26	A+PTR	oab.cbeyondonline.net
50.20.30.29	A	omx.cbeyond.com
50.20.30.30	A+PTR	omx.cbeyond.com