Robtex

Up: 205.158.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 205.158.160.0/20
Down right: 205.158.176.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
205.158.160.11	A	pladnsprd02.pla.dc.xo.com
205.158.160.11	A	ns1.dc.xo.com
205.158.160.11	A	txplano-ns01.dc.xo.com
205.158.160.41	A	xostats.xo.com
205.158.160.41	A	x41.xostats.xo.com
205.158.160.41	A	plaxosprd01.pla.dc.xo.com
205.158.160.43	A	x43.xostats.xo.com
205.158.160.65	A	citrixsgvip.pla.dc.xo.com
205.158.160.66	A+PTR	plawblprd07.pla.dc.xo.com
205.158.160.67	A+PTR	plaxonprd02.pla.dc.xo.com
205.158.160.76	A	xonlbvip.pla.dc.xo.com
205.158.160.96	PTR	sfbext.xo.com
205.158.160.96	A	dialin.xo.com
205.158.160.113	A	lyncwc.xo.com
205.158.160.115	A	lyncav.xo.com
205.158.160.117	A	dialin.xo.com
205.158.160.117	A	meet.xo.com
205.158.160.131	A	vpn-c1.xo.com
205.158.160.132	A	vpn-c2.xo.com
205.158.160.209	A	txplan01-nat209.dc.xo.com
205.158.160.215	A	txplan01-nat215.dc.xo.com
205.158.162.70	A	bastion.svc.us.xo.net
205.158.162.71	A	bastion.svc.us.xo.net
205.158.162.71	A	taurus.sys.us.xo.net
205.158.163.88	A	205.158.163.88.ptr.us.xo.net
205.158.163.103	A	205.158.163.103.ptr.us.xo.net
205.158.164.74	A	mail.progressive-is.com
205.158.164.74	A	mail.thinfilm.com
205.158.165.227	PTR	205.158.165.227.ptr.us.xo.net
205.158.165.227	A	tpemail.com
205.158.165.232	A	victorygardenfresh.com
205.158.166.19	A	smtp.telava.com
205.158.166.19	A	mail.telava.com
205.158.166.19	A	mail.wwcap.com
205.158.167.50	A	205.158.167.50.ptr.us.xo.net
205.158.168.121	A	205.158.168.121.ptr.us.xo.net
205.158.168.227	A+PTR	205.158.168.227.ptr.us.xo.net
205.158.168.227	A	oxnet.net
205.158.169.67	PTR	205.158.169.67.ptr.us.xo.net
205.158.169.67	A	recruitforce.com
205.158.170.67	PTR	205.158.170.67.ptr.us.xo.net
205.158.170.67	A	sspi.co
205.158.174.0	A	205.158.174.0.ptr.us.xo.net
205.158.174.99	A	magpiemail.com
205.158.176.0	A	205.158.176.0.ptr.us.xo.net
205.158.177.141	A	205.158.177.141.ptr.us.xo.net
205.158.178.9	A	205.158.178.9.ptr.us.xo.net
205.158.179.0	A	205.158.179.0.ptr.us.xo.net
205.158.179.165	A	205.158.179.165.ptr.us.xo.net
205.158.179.165	A	ns2.xtec.com
205.158.179.231	A	205.158.179.231.ptr.us.xo.net
205.158.180.100	A	nt1.horizonpractice.com
205.158.184.68	A	205.158.184.68.ptr.us.xo.net
205.158.189.155	A	peoplecoeur.com
205.158.190.39	A	205.158.190.39.ptr.us.xo.net
205.158.190.67	A	205.158.190.67.ptr.us.xo.net
205.158.190.146	A	205.158.190.146.ptr.us.xo.net
205.158.190.173	A	205.158.190.173.ptr.us.xo.net
205.158.190.244	A	205.158.190.244.ptr.us.xo.net
205.158.191.219	A	205.158.191.219.ptr.us.xo.net