Robtex

Up: 74.209.136.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 74.209.137.0/25
Down right: 74.209.137.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
74.209.137.33	A+PTR	nntpjunkie.com
74.209.137.33	A+PTR	www.nntpjunkie.com
74.209.137.33	A	www.nntpjunkie.net
74.209.137.41	A+PTR	www.spamhippo.com
74.209.137.41	A	spamhippo.net
74.209.137.41	A	spamhippo.org
74.209.137.45	A+PTR	mx0.newsguy.com
74.209.137.46	A+PTR	mx1.newsguy.com
74.209.137.48	A	drn.nntpjunkie.com
74.209.137.65	A+PTR	news.nntpjunkie.com
74.209.137.66	A+PTR	news.nntpjunkie.com
74.209.137.67	PTR	news.nntpjunkie.com
74.209.137.68	A+PTR	news.nntpjunkie.com
74.209.137.69	PTR	news.nntpjunkie.com
74.209.137.81	A+PTR	mx1.realguns.com
74.209.137.201	A	eroticreportercom.spamhippo.com
74.209.137.202	A	rgicentralcom.spamhippo.com