Robtex

Up: 8.43.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 8.43.72.0/23
Down right: 8.43.74.0/23

IP	Type	Hostname
8.43.72.21	A	pixel.rubiconproject.net.akadns.net
8.43.72.23	A	cca-iad2.rubiconproject.com
8.43.72.24	A	beacon.rubiconproject.net.akadns.net
8.43.72.32	A	perf-optimized-by.rubiconproject.net.akadns.net
8.43.72.33	A	exapi-us-east.rubiconproject.net.akadns.net
8.43.72.34	A	beacon.rubiconproject.net.akadns.net
8.43.72.38	A	exapi-us-east.rubiconproject.net.akadns.net
8.43.72.39	A	exapi-us-east.rubiconproject.net.akadns.net
8.43.72.42	A	perf-optimized-by.rubiconproject.net.akadns.net
8.43.72.44	A	beacon.rubiconproject.net.akadns.net
8.43.72.46	A	exapi-us-east.rubiconproject.net.akadns.net
8.43.72.52	A	perf-optimized-by.rubiconproject.net.akadns.net
8.43.72.54	A	beacon.rubiconproject.net.akadns.net
8.43.72.58	A	exapi-us-east.rubiconproject.net.akadns.net
8.43.72.62	A	perf-optimized-by.rubiconproject.net.akadns.net
8.43.72.64	A	beacon.rubiconproject.net.akadns.net
8.43.72.65	A	beacon-nf.rubiconproject.net.akadns.net
8.43.72.75	A	beacon-nf.rubiconproject.net.akadns.net
8.43.72.85	A	staged-by.rubiconproject.com
8.43.72.95	A	staged-by.rubiconproject.com
8.43.72.97	A	pixel.rubiconproject.net.akadns.net
8.43.72.97	A	pixel-us-east.rubiconproject.net.akadns.net
8.43.72.97	A	pixel-us-east.rubiconproject.com
8.43.72.98	A	pixel.rubiconproject.net.akadns.net
8.43.72.98	A	pixel-us-east.rubiconproject.net.akadns.net
8.43.72.98	A	pixel-us-east.rubiconproject.com
8.43.72.113	A	perf-optimized-by.rubiconproject.net.akadns.net