Robtex

Up: 216.244.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 216.244.24.0/22
Down right: 216.244.28.0/22

IP	Type	Hostname
216.244.24.32	A+PTR	user-3cf8610.dsl.mindspring.com
216.244.24.50	A+PTR	user-3cf861i.dsl.mindspring.com
216.244.24.51	A+PTR	user-3cf861j.dsl.mindspring.com
216.244.24.128	A+PTR	user-3cf8640.dsl.mindspring.com
216.244.24.191	A	user-3cf865v.dsl.mindspring.com
216.244.24.243	A+PTR	user-3cf867j.dsl.mindspring.com
216.244.25.43	A+PTR	user-3cf869b.dsl.mindspring.com
216.244.25.178	A	user-3cf86di.dsl.mindspring.com
216.244.25.213	A	user-3cf86el.dsl.mindspring.com
216.244.25.246	A	user-3cf86fm.dsl.mindspring.com
216.244.26.42	A+PTR	user-3cf86ha.dsl.mindspring.com
216.244.26.123	A+PTR	user-3cf86jr.dsl.mindspring.com
216.244.26.135	A	user-3cf86k7.dsl.mindspring.com
216.244.26.146	A+PTR	user-3cf86ki.dsl.mindspring.com
216.244.27.11	A+PTR	user-3cf86ob.dsl.mindspring.com
216.244.27.102	A	user-3cf86r6.dsl.mindspring.com
216.244.27.247	A	user-3cf86vn.dsl.mindspring.com
216.244.28.10	A+PTR	user-3cf870a.dsl.mindspring.com
216.244.28.20	A	user-3cf870k.dsl.mindspring.com
216.244.28.79	A	user-3cf872f.dsl.mindspring.com
216.244.28.189	A	user-3cf875t.dsl.mindspring.com
216.244.28.205	A	user-3cf876d.dsl.mindspring.com
216.244.29.44	A	user-3cf879c.dsl.mindspring.com
216.244.29.108	A	user-3cf87bc.dsl.mindspring.com
216.244.29.177	A+PTR	user-3cf87dh.dsl.mindspring.com
216.244.29.188	A	user-3cf87ds.dsl.mindspring.com
216.244.29.201	A+PTR	user-3cf87e9.dsl.mindspring.com
216.244.30.36	A	user-3cf87h4.dsl.mindspring.com
216.244.30.104	PTR	user-3cf87j8.dsl.mindspring.com
216.244.30.152	A+PTR	user-3cf87ko.dsl.mindspring.com
216.244.30.183	A	user-3cf87ln.dsl.mindspring.com
216.244.30.199	A	user-3cf87m7.dsl.mindspring.com
216.244.30.240	A+PTR	user-3cf87ng.dsl.mindspring.com
216.244.31.100	A	user-3cf87r4.dsl.mindspring.com
216.244.31.155	A+PTR	user-3cf87sr.dsl.mindspring.com
216.244.31.242	A+PTR	user-3cf87vi.dsl.mindspring.com