Robtex

Up: 66.165.166.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.165.167.0/25
Down right: 66.165.167.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.165.167.25	A+PTR	iportal.xtec.com
66.165.167.50	A+PTR	xtec.com
66.165.167.50	A	www.xtec.com
66.165.167.50	A	xtec1.xtec.com
66.165.167.55	A+PTR	xtravalue.com
66.165.167.60	A+PTR	test.xtec.com
66.165.167.60	A	mail.xtec.com
66.165.167.60	A	a.mx.test.xtec.com
66.165.167.95	A+PTR	pivi.authentx.com
66.165.167.95	A	frb.pivi.authentx.com
66.165.167.100	A+PTR	authentx.com
66.165.167.100	A+PTR	xpki.com
66.165.167.100	A	aia.xpki.com
66.165.167.104	A	mac.authentx.com
66.165.167.110	A+PTR	collab.xtec.com
66.165.167.120	A	piv.authentx.com
66.165.167.135	A+PTR	dhs.authentx.com
66.165.167.140	A+PTR	smtp.authentx.com
66.165.167.140	A	mail.authentx.com
66.165.167.165	A	ns1.xtec.com
66.165.167.189	A+PTR	enabler.authentx.com
66.165.167.200	PTR	dhs.authentx.com