Robtex

Up: 64.147.108.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 64.147.108.0/25
Down right: 64.147.108.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.147.108.3	A+PTR	gw1-nyi.icgroup.com
64.147.108.21	A	lab.pobox.com
64.147.108.23	A+PTR	ns4.pobox.com
64.147.108.23	A	ns1.icgroup.com
64.147.108.23	A	ns3.rightbox.com
64.147.108.24	A+PTR	ns5.pobox.com
64.147.108.24	A	ns4.rightbox.com
64.147.108.24	A	ns2.rightbox.com
64.147.108.25	A+PTR	ns6.pobox.com
64.147.108.25	A	ns3.rightbox.com
64.147.108.26	A+PTR	ns7.pobox.com
64.147.108.26	A	ns4.rightbox.com
64.147.108.26	A	spectrobes.net
64.147.108.29	A	thewolfiswatching.com
64.147.108.30	A+PTR	mail.pobox.com
64.147.108.30	A+PTR	public-mailstore.pobox.com
64.147.108.30	A	mail.sophists.com
64.147.108.40	PTR	www.pobox.com
64.147.108.40	A	miratrix.us
64.147.108.40	A	nwkitchenklatch.com
64.147.108.49	PTR	pb-aux1.pobox.com
64.147.108.49	A	mail.thewolfiswatching.com
64.147.108.49	A	mail.serenitymovie.com
64.147.108.50	PTR	pb-mx9.pobox.com
64.147.108.50	A	mx2.rightbox.com
64.147.108.50	A	mx5.rightbox.com
64.147.108.51	PTR	pb-mx10.pobox.com
64.147.108.51	A	mx2.rightbox.com
64.147.108.51	A	mx5.rightbox.com
64.147.108.52	PTR	pb-mx11.pobox.com
64.147.108.52	A	mx2.rightbox.com
64.147.108.52	A	mx5.rightbox.com
64.147.108.53	A+PTR	pb-mx12.pobox.com
64.147.108.53	A	mx-5.rightbox.com
64.147.108.53	A	mail2.cpr-tech.co.uk
64.147.108.54	A+PTR	pb-mx13.pobox.com
64.147.108.54	A	mx-5.rightbox.com
64.147.108.54	A	mail2.cpr-tech.co.uk
64.147.108.55	PTR	pb-mx14.pobox.com
64.147.108.55	A	mx2.rightbox.com
64.147.108.55	A	mx5.rightbox.com
64.147.108.66	A+PTR	pb-sasl1.pobox.com
64.147.108.66	A	smtp.jonahtobias.com
64.147.108.66	A	sasl.smtp.pobox.com
64.147.108.67	A+PTR	pb-sasl2.pobox.com
64.147.108.67	A	smtp.jonahtobias.com
64.147.108.67	A	sasl.smtp.pobox.com
64.147.108.68	A	jnalley.com
64.147.108.68	A	mail.spreadthegood.com
64.147.108.70	A+PTR	pb-smtp1.pobox.com
64.147.108.70	A	smtp.pobox.com
64.147.108.71	A+PTR	pb-smtp2.pobox.com
64.147.108.71	A	smtp.pobox.com
64.147.108.74	A+PTR	pb-bounce4.pobox.com
64.147.108.74	A	bounce2.pobox.com
64.147.108.75	A+PTR	pb-bounce5.pobox.com
64.147.108.75	A	bounce2.pobox.com
64.147.108.81	A	mail.pwww.com
64.147.108.90	A+PTR	dstore1.pobox.com
64.147.108.90	A	gnsa.us
64.147.108.90	A	nalley.me
64.147.108.101	PTR	www.listbox.com
64.147.108.101	A	aahdlistserve.org
64.147.108.101	A	listbox.com
64.147.108.103	A+PTR	storage.listbox.com
64.147.108.103	A	v2.listbox.com
64.147.108.110	A+PTR	mx2.listbox.com
64.147.108.110	A	mx-all.listbox.com
64.147.108.110	A	mx-1.listbox.com
64.147.108.111	A+PTR	mx3.listbox.com
64.147.108.111	A	mx-all.listbox.com
64.147.108.111	A	mx-2.listbox.com
64.147.108.116	A+PTR	lb-ob2.listbox.com
64.147.108.116	A	outbound.listbox.com
64.147.108.117	A+PTR	lb-ob3.listbox.com
64.147.108.117	A	outbound.listbox.com
64.147.108.126	A+PTR	fb2.listbox.com
64.147.108.126	A	fallback-relay.listbox.com
64.147.108.127	A+PTR	fb3.listbox.com
64.147.108.127	A	fallback-relay.listbox.com
64.147.108.130	A+PTR	lb-arc2.nyi.icgroup.com
64.147.108.130	PTR	arc2.listbox.com
64.147.108.130	A	postlink.www.listbox.com
64.147.108.131	A+PTR	lb-arc3.nyi.icgroup.com
64.147.108.131	PTR	arc3.listbox.com
64.147.108.131	A	postlink.www.listbox.com
64.147.108.132	A	eacorporation.com
64.147.108.138	A	mail.optimohs.com
64.147.108.138	A	mail.fairbairnranch.com
64.147.108.138	A	mail.ucaia.com
64.147.108.140	A+PTR	mx2.icgroup.com
64.147.108.141	A+PTR	mx3.icgroup.com
64.147.108.161	PTR	tb-scratch0.topicbox-scratch.com
64.147.108.161	A	topicbox-scratch-usercontent.com
64.147.108.161	A	topicbox-scratch.com
64.147.108.162	A+PTR	preview.topicbox.com
64.147.108.166	A+PTR	tb-mx0.topicbox.com
64.147.108.166	A	mx0.topicbox.com
64.147.108.167	A+PTR	tb-mx1.topicbox.com
64.147.108.167	A	mx1.topicbox.com
64.147.108.168	A+PTR	www.topicbox.com
64.147.108.168	A	topicbox.com
64.147.108.168	A	topicbox-usercontent.com
64.147.108.169	A+PTR	tb-beta0.topicbox.com
64.147.108.169	A	topicbox-beta.com
64.147.108.169	A	topicbox-beta-usercontent.com
64.147.108.193	A	umbearfacts.net
64.147.108.193	A	umbearfacts.org
64.147.108.193	A	umbearfacts.com