Robtex

Up: 72.1.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.1.148.0/23
Down right: 72.1.150.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.1.148.0	PTR	dsl001-148-000.sfo1.dsl.speakeasy.net
72.1.148.2	PTR	dsl001-148-002.sfo1.dsl.speakeasy.net
72.1.148.22	A+PTR	dsl001-148-022.sfo1.dsl.speakeasy.net
72.1.148.31	A	mail.7hm.net
72.1.148.32	A+PTR	dsl001-148-032.sfo1.dsl.speakeasy.net
72.1.148.55	PTR	dsl001-148-055.sfo1.dsl.speakeasy.net
72.1.148.62	PTR	dsl001-148-062.sfo1.dsl.speakeasy.net
72.1.148.71	PTR	dsl001-148-071.sfo1.dsl.speakeasy.net
72.1.148.81	A+PTR	dsl001-148-081.sfo1.dsl.speakeasy.net
72.1.148.83	PTR	dsl001-148-083.sfo1.dsl.speakeasy.net
72.1.148.89	A+PTR	dsl001-148-089.sfo1.dsl.speakeasy.net
72.1.148.90	A+PTR	dsl001-148-090.sfo1.dsl.speakeasy.net
72.1.149.1	PTR	dsl001-149-001.sfo1.dsl.speakeasy.net
72.1.149.5	A+PTR	dsl001-149-005.sfo1.dsl.speakeasy.net
72.1.149.10	A	mail.hoodthomas.com
72.1.149.15	PTR	ns2.augustinecorp.com
72.1.149.18	A+PTR	dsl001-149-018.sfo1.dsl.speakeasy.net
72.1.149.25	A+PTR	dsl001-149-025.sfo1.dsl.speakeasy.net
72.1.149.31	A+PTR	dsl001-149-031.sfo1.dsl.speakeasy.net
72.1.149.32	A+PTR	dsl001-149-032.sfo1.dsl.speakeasy.net
72.1.149.33	A+PTR	dsl001-149-033.sfo1.dsl.speakeasy.net
72.1.149.35	PTR	mx2.schaferlabs.com
72.1.149.36	A+PTR	dsl001-149-036.sfo1.dsl.speakeasy.net
72.1.149.37	A+PTR	dsl001-149-037.sfo1.dsl.speakeasy.net
72.1.149.38	A+PTR	dsl001-149-038.sfo1.dsl.speakeasy.net
72.1.149.45	PTR	dsl001-149-045.sfo1.dsl.speakeasy.net
72.1.149.54	A+PTR	dsl001-149-054.sfo1.dsl.speakeasy.net
72.1.149.74	PTR	dsl001-149-074.sfo1.dsl.speakeasy.net
72.1.149.81	A+PTR	dsl001-149-081.sfo1.dsl.speakeasy.net
72.1.149.82	PTR	dsl001-149-082.sfo1.dsl.speakeasy.net
72.1.149.83	PTR	dsl001-149-083.sfo1.dsl.speakeasy.net
72.1.149.84	PTR	dsl001-149-084.sfo1.dsl.speakeasy.net
72.1.149.85	A+PTR	dsl001-149-085.sfo1.dsl.speakeasy.net
72.1.149.100	A	mail.etzleinu.com
72.1.149.100	A	server.etzleinu.net
72.1.149.100	A	server.etzleinu.com
72.1.149.119	A+PTR	dsl001-149-119.sfo1.dsl.speakeasy.net
72.1.149.139	A+PTR	dsl001-149-139.sfo1.dsl.speakeasy.net
72.1.149.157	A+PTR	dsl001-149-157.sfo1.dsl.speakeasy.net
72.1.149.169	PTR	deathstar.bdtechnical.com
72.1.149.186	A+PTR	dsl001-149-186.sfo1.dsl.speakeasy.net
72.1.149.199	A+PTR	dsl001-149-199.sfo1.dsl.speakeasy.net
72.1.149.215	A+PTR	dsl001-149-215.sfo1.dsl.speakeasy.net
72.1.149.216	A+PTR	dsl001-149-216.sfo1.dsl.speakeasy.net
72.1.149.223	A+PTR	dsl001-149-223.sfo1.dsl.speakeasy.net
72.1.149.232	PTR	tiger.istumbler.net
72.1.149.236	A+PTR	dsl001-149-236.sfo1.dsl.speakeasy.net
72.1.149.236	A	pricegroup.org
72.1.149.238	PTR	caracal.istumbler.net
72.1.150.12	A+PTR	dsl001-150-012.sfo1.dsl.speakeasy.net
72.1.150.15	A+PTR	dsl001-150-015.sfo1.dsl.speakeasy.net
72.1.150.17	PTR	dsl001-150-017.sfo1.dsl.speakeasy.net
72.1.150.18	A+PTR	dsl001-150-018.sfo1.dsl.speakeasy.net
72.1.150.19	PTR	dsl001-150-019.sfo1.dsl.speakeasy.net
72.1.150.39	PTR	dsl001-150-039.sfo1.dsl.speakeasy.net
72.1.150.43	PTR	dsl001-150-043.sfo1.dsl.speakeasy.net
72.1.150.49	PTR	dsl001-150-049.sfo1.dsl.speakeasy.net
72.1.150.50	PTR	dsl001-150-050.sfo1.dsl.speakeasy.net
72.1.150.52	PTR	dsl001-150-052.sfo1.dsl.speakeasy.net
72.1.150.70	PTR	dsl001-150-070.sfo1.dsl.speakeasy.net
72.1.150.72	PTR	dsl001-150-072.sfo1.dsl.speakeasy.net
72.1.150.81	PTR	dsl001-150-081.sfo1.dsl.speakeasy.net
72.1.150.82	A+PTR	dsl001-150-082.sfo1.dsl.speakeasy.net
72.1.150.98	PTR	dsl001-150-098.sfo1.dsl.speakeasy.net
72.1.150.140	PTR	absoludicrous.com
72.1.150.143	PTR	420chan.net
72.1.150.252	PTR	dsl001-150-252.sfo1.dsl.speakeasy.net
72.1.151.1	PTR	mtv001.global.com
72.1.151.4	A	mx.dinostor.com
72.1.151.5	PTR	mx.invient.com
72.1.151.6	PTR	mtv006.global.com
72.1.151.8	PTR	mtv008.global.com
72.1.151.15	PTR	www.global.com
72.1.151.20	PTR	global.com
72.1.151.23	PTR	dinostor.com
72.1.151.24	A+PTR	invient.com
72.1.151.25	A	mx5.global.com
72.1.151.26	PTR	mtv026.global.com
72.1.151.34	PTR	mtv034.global.com
72.1.151.36	PTR	mtv036.global.com
72.1.151.42	PTR	mtv042.global.com
72.1.151.48	PTR	mtv048.global.com
72.1.151.49	PTR	mtv049.global.com
72.1.151.55	PTR	mtv055.global.com
72.1.151.59	PTR	mtv059.global.com
72.1.151.63	PTR	mtv063.global.com
72.1.151.67	PTR	mtv067.global.com
72.1.151.73	PTR	mtv073.global.com
72.1.151.90	PTR	mtv090.global.com