Robtex

Up: 72.1.128.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.1.132.0/23
Down right: 72.1.134.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.1.132.98	PTR	mail.portland-monthly.com
72.1.133.4	A	dsl001-133-004.pdx1.dsl.speakeasy.net
72.1.133.6	A+PTR	dsl001-133-006.pdx1.dsl.speakeasy.net
72.1.133.9	A	dsl001-133-009.pdx1.dsl.speakeasy.net
72.1.133.16	A	dsl001-133-016.pdx1.dsl.speakeasy.net
72.1.133.18	A	dsl001-133-018.pdx1.dsl.speakeasy.net
72.1.133.22	A	dsl001-133-022.pdx1.dsl.speakeasy.net
72.1.133.32	A	dsl001-133-032.pdx1.dsl.speakeasy.net
72.1.133.37	A	dsl001-133-037.pdx1.dsl.speakeasy.net
72.1.133.90	PTR	dsl001-133-090.pdx1.dsl.speakeasy.net
72.1.133.90	A	mail.triskelion-nova.com
72.1.133.90	A	tech-otter.net
72.1.133.143	A+PTR	dsl001-133-143.pdx1.dsl.speakeasy.net
72.1.133.143	A	mkpcaparchive.com
72.1.133.143	A	globalcreditpartnersarchive.com
72.1.133.179	A+PTR	dsl001-133-179.pdx1.dsl.speakeasy.net
72.1.133.246	PTR	dsl001-133-246.pdx1.dsl.speakeasy.net
72.1.133.246	A	bruce4.com
72.1.133.254	A	dsl001-133-254.pdx1.dsl.speakeasy.net
72.1.134.5	A	fs.entros.net
72.1.134.6	PTR	hs1.seattle7.com
72.1.134.7	PTR	hs1.entros.net
72.1.134.112	PTR	eidolon.muppetlabs.com
72.1.134.136	PTR	mail.millergarden.org
72.1.134.136	A	mail.millergarden.com
72.1.134.136	A	mail.millergarden.net
72.1.135.26	A+PTR	dsl001-135-026.sea1.dsl.speakeasy.net
72.1.135.96	A+PTR	dsl001-135-096.sea1.dsl.speakeasy.net
72.1.135.104	A+PTR	dsl001-135-104.sea1.dsl.speakeasy.net
72.1.135.118	A+PTR	dsl001-135-118.sea1.dsl.speakeasy.net
72.1.135.199	A+PTR	dsl001-135-199.sea1.dsl.speakeasy.net
72.1.135.227	A+PTR	dsl001-135-227.sea1.dsl.speakeasy.net
72.1.135.228	A+PTR	dsl001-135-228.sea1.dsl.speakeasy.net
72.1.135.233	A+PTR	dsl001-135-233.sea1.dsl.speakeasy.net
72.1.135.234	A+PTR	dsl001-135-234.sea1.dsl.speakeasy.net
72.1.135.237	A+PTR	dsl001-135-237.sea1.dsl.speakeasy.net
72.1.135.244	A+PTR	dsl001-135-244.sea1.dsl.speakeasy.net
72.1.135.245	A+PTR	dsl001-135-245.sea1.dsl.speakeasy.net
72.1.135.250	A+PTR	dsl001-135-250.sea1.dsl.speakeasy.net
72.1.135.251	A+PTR	dsl001-135-251.sea1.dsl.speakeasy.net