Robtex

Up: 204.56.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 204.56.0.0/22
Down right: 204.56.4.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.56.0.137	A+PTR	kc-sce-plab1.umkc.edu
204.56.0.138	PTR	kc-sce-plab2.umkc.edu
204.56.0.138	A	204.56.0.138.ip4.nyucd.net
204.56.0.138	A	rtsakwc.www-escort-e-ro.http.l2.l1.l0.nyucd.net
204.56.4.146	A	mail.bergeo.biz
204.56.4.146	A	bergeo.biz
204.56.4.152	A	mail.mriks.com
204.56.4.160	A	mail.mckeekc.com
204.56.6.9	PTR	webmail.stowers-institute.org
204.56.6.9	PTR	webmail.stowers.org
204.56.6.9	A	mail03.stowers.org
204.56.6.10	PTR	stowers-institute.biz
204.56.6.10	PTR	stowersinstitute.biz
204.56.6.10	PTR	stowers-institute.com
204.56.6.19	PTR	mail02.stowers-institute.org
204.56.6.19	PTR	mail02.stowers.org
204.56.6.19	A	mail04.stowers.org
204.56.6.80	PTR	204-56-6-80.stowers-institute.org
204.56.7.1	A+PTR	ns1.lindahall.org
204.56.7.130	A	lhldigital.lindahall.org
204.56.7.200	A	lhlcloud.org
204.56.7.200	A	www.lindahall.org
204.56.7.200	A	lindahall.org
204.56.7.211	PTR	www.lindahall.org