Robtex

Up: 144.160.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 144.160.128.0/21
Down right: 144.160.136.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
144.160.128.137	A+PTR	nbc-01.sbc.com
144.160.128.140	A+PTR	ns2.attdns.com
144.160.128.141	A+PTR	ns2placeholder.attdns.com
144.160.128.142	A+PTR	gd2a.attdns.com
144.160.128.144	A+PTR	sbcsmtp8.sbc.com
144.160.128.144	A	mxfailover.att.com
144.160.128.146	A	fsiglb-ff-1.attdns.com
144.160.128.148	A+PTR	ffflf5pc-2.attdns.net
144.160.128.155	A	gd2a.attdns.com
144.160.128.166	A+PTR	egssmtp02.att.com
144.160.128.171	A+PTR	gd2b.attdns.com
144.160.128.174	A	icescdti.att.com
144.160.128.177	A+PTR	ns10b.attdns.net
144.160.128.179	A+PTR	bulksmtp02.att.com
144.160.128.180	A+PTR	bulkhvsmtp02.att.com
144.160.128.182	A+PTR	bulksmtp03.att.com
144.160.131.10	A+PTR	elearning.sbc.com
144.160.131.16	PTR	bbtiuat.test.att.com
144.160.131.110	A	e911im-ca.sbc.com
144.160.131.114	A+PTR	icesweb.att.com
144.160.131.114	A+PTR	icesweb.sbc.com
144.160.131.116	A+PTR	fipcap1.sbc.com
144.160.131.117	A+PTR	fipcap2.sbc.com
144.160.131.154	A	tcdirectorylink.att.com
144.160.132.12	A+PTR	policycerts2.att.com
144.160.132.15	A+PTR	sdwanmow-crl.att.com
144.160.132.15	A	dhvpn-crl.att.com
144.160.132.18	A	tomtracker.com
144.160.132.18	A	connect.lmberry.com
144.160.133.17	A+PTR	homevpn.att.com
144.160.133.23	PTR	empvca.vpn.att.com
144.160.133.23	A	empvff.att.com
144.160.133.26	A	empvtestff.sbc.com
144.160.133.38	A	uscassl.vpn.att.com
144.160.133.43	A	caemp4a.vpn.att.com
144.160.134.41	A	ameritech.com
144.160.134.48	PTR	espanol.att.com
144.160.134.49	PTR	tagalog.att.com
144.160.134.50	PTR	vietnamese.att.com
144.160.134.53	PTR	chinese.att.com
144.160.134.60	A	mf2.att.com
144.160.134.177	A+PTR	togglecerts-test.att.net
144.160.134.178	A+PTR	togglecerts.att.net
144.160.135.198	PTR	oauth.idp.elogin.att.com
144.160.137.34	A+PTR	cwmp-ffldca.c01.sbcglobal.net
144.160.137.151	A+PTR	lsbbt.sbcglobal.net
144.160.137.152	A+PTR	siptwopmoss.att.com
144.160.142.20	A	caapplnc1.sbc.com
144.160.142.26	A	mobileq.att.com
144.160.142.35	A+PTR	see.sbc.com
144.160.142.38	A	ecorpscm.sbc.com
144.160.142.39	A	ecorpscmits.sbc.com
144.160.142.43	A	xid.sbctest.com
144.160.142.99	A+PTR	ecorpc3p.sbc.com
144.160.142.101	A	lsocp.sbc.com
144.160.142.145	A	mobilegwstg.att.com
144.160.142.146	A	mobilegwtst.att.com
144.160.142.147	A	mobilecrb.att.com
144.160.142.148	A	mobilegtwy.att.com
144.160.142.213	A	xi9.sbctest.com
144.160.142.215	A+PTR	xi8.sbctest.com
144.160.143.24	A	www.attsuppliers.com
144.160.143.24	A	attsuppliers.com
144.160.143.41	A+PTR	xpaytelco.att.com
144.160.143.42	A+PTR	xpaytelco.sbc.com
144.160.143.51	A	smc.att.com
144.160.143.51	A	prospecteyewear.org
144.160.143.51	A	prospecteyewear.net
144.160.143.62	PTR	sbc.com
144.160.143.76	PTR	csct.att.com