Robtex

Up: 206.29.176.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 206.29.180.0/23
Down right: 206.29.182.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
206.29.180.43	A+PTR	receiver.t-mobile.com
206.29.180.50	A+PTR	inetp-ohn-ore02.t-mobile.com
206.29.180.51	A+PTR	inetp-ohn-ore03.t-mobile.com
206.29.180.74	PTR	wwxore01.t-mobile.com
206.29.180.131	A	o.my.t-mobile.com
206.29.180.133	A	www2.myfamilymobile.com
206.29.180.147	A	sts3.geo.t-mobile.com
206.29.180.147	A	sts3.t-mobile.com
206.29.180.184	A+PTR	o.manage.my.t-mobile.com
206.29.181.10	A+PTR	tmo-o.t-mobile.com
206.29.181.10	A+PTR	www-lb.t-mobile.com
206.29.181.36	A	dp.geo.t-mobile.com
206.29.181.130	A+PTR	ns4.t-mobile.com
206.29.181.131	A+PTR	geo6.t-mobile.com
206.29.181.187	A+PTR	webmail2.t-mobile.com
206.29.181.187	A	webmail2013.geo.t-mobile.com
206.29.181.228	A+PTR	mail02.myfamilymobile.com
206.29.181.228	A+PTR	mail02.t-mobile.com
206.29.181.228	A+PTR	mail02.t-mobileorders.com
206.29.181.229	A+PTR	mail02.myfamilymobile.com
206.29.181.229	A+PTR	mail02.t-mobile.com
206.29.181.229	A+PTR	mail02.t-mobileorders.com
206.29.181.230	A+PTR	mail02.myfamilymobile.com
206.29.181.230	A+PTR	mail02.t-mobile.com
206.29.181.230	A+PTR	mail02.t-mobileorders.com
206.29.181.231	A+PTR	mail02.myfamilymobile.com
206.29.181.231	A+PTR	mail02.t-mobile.com
206.29.181.231	A+PTR	mail02.t-mobileorders.com
206.29.181.243	PTR	mail2.gosmartmobile.com
206.29.181.243	A+PTR	mail2.myfamilymobile.com
206.29.181.243	A+PTR	mail2.t-mobile.com
206.29.181.244	PTR	mail2.gosmartmobile.com
206.29.181.244	A+PTR	mail2.myfamilymobile.com
206.29.181.244	A+PTR	mail2.t-mobile.com
206.29.181.245	PTR	mail2.gosmartmobile.com
206.29.181.245	A+PTR	mail2.myfamilymobile.com
206.29.181.245	A+PTR	mail2.t-mobile.com
206.29.181.246	PTR	mail2.gosmartmobile.com
206.29.181.246	A+PTR	mail2.myfamilymobile.com
206.29.181.246	A+PTR	mail2.t-mobile.com
206.29.181.247	PTR	mail2.gosmartmobile.com
206.29.181.247	A+PTR	mail2.myfamilymobile.com
206.29.181.247	A+PTR	mail2.t-mobile.com
206.29.181.250	A+PTR	mailb.brightspotmobile.com
206.29.181.250	PTR	mailb.gosmartmobile.com
206.29.181.250	PTR	mailb.t-mobile.com
206.29.181.251	A+PTR	mailb.brightspotmobile.com
206.29.181.251	PTR	mailb.gosmartmobile.com
206.29.181.251	PTR	mailb.t-mobile.com
206.29.181.252	PTR	maib.brightspotmobile.com
206.29.181.252	A+PTR	mailb.brightspotmobile.com
206.29.181.252	PTR	mailb.gosmartmobile.com
206.29.181.253	A+PTR	mailb.brightspotmobile.com
206.29.181.253	PTR	mailb.gosmartmobile.com
206.29.181.253	PTR	mailb.t-mobile.com
206.29.182.41	A	ns5.t-mobile.com