Robtex

Up: 192.88.18.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.88.19.0/25
Down right: 192.88.19.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.88.19.10	A	doc-stage.uprinv.com
192.88.19.16	A+PTR	api.stage1.acs529.com
192.88.19.21	A+PTR	cdn.stage1.uprinv.com
192.88.19.21	A+PTR	cdn.stage1.acs529.com
192.88.19.60	A+PTR	swl.stage1.uprinv.com
192.88.19.60	A+PTR	swl.stage1.acs529.com
192.88.19.142	A+PTR	swa.stage3.uprinv.com
192.88.19.142	A+PTR	swa.stage3.acs529.com
192.88.19.251	A	stage1.uprinv.com
192.88.19.252	PTR	*.stage2.uprinv.com
192.88.19.252	A	stage2.uprinv.com
192.88.19.254	A+PTR	nyd.stage4.acs529.com
192.88.19.254	A+PTR	oh.stage4.acs529.com
192.88.19.254	A+PTR	*.stage4.uprinv.com