Robtex

Up: 64.31.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 64.31.156.0/23
Down right: 64.31.158.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.31.156.38	PTR	mail.lyonfrycadden.com
64.31.156.74	PTR	mail.lyonfrycadden
64.31.157.62	PTR	smtp.vilden.com
64.31.157.71	PTR	winkenterprises.adelphiabusiness.net
64.31.157.73	PTR	winkenterprises.adelphiabusiness.net
64.31.157.74	PTR	winkenterprises.adelphiabusiness.net
64.31.157.75	PTR	winkenterprises.adelphiabusiness.net
64.31.157.76	PTR	winkenterprises.adelphiabusiness.net
64.31.157.79	PTR	winkenterprises.adelphiabusiness.net
64.31.157.80	PTR	winkenterprises.adelphiabusiness.net
64.31.157.83	PTR	winkenterprises.adelphiabusiness.net
64.31.157.84	PTR	winkenterprises.adelphiabusiness.net
64.31.157.85	PTR	winkenterprises.adelphiabusiness.net
64.31.157.89	PTR	winkenterprises.adelphiabusiness.net
64.31.157.93	PTR	winkenterprises.adelphiabusiness.net
64.31.157.96	PTR	winkenterprises.adelphiabusiness.net
64.31.157.97	PTR	winkenterprises.adelphiabusiness.net
64.31.157.99	PTR	winkenterprises.adelphiabusiness.net
64.31.157.103	PTR	winkenterprises.adelphiabusiness.net
64.31.157.107	PTR	winkenterprises.adelphiabusiness.net
64.31.157.108	PTR	winkenterprises.adelphiabusiness.net
64.31.157.109	PTR	winkenterprises.adelphiabusiness.net
64.31.157.110	PTR	winkenterprises.adelphiabusiness.net
64.31.157.112	PTR	winkenterprises.adelphiabusiness.net
64.31.157.113	PTR	winkenterprises.adelphiabusiness.net
64.31.157.117	PTR	winkenterprises.adelphiabusiness.net
64.31.157.123	PTR	winkenterprises.adelphiabusiness.net
64.31.157.126	PTR	winkenterprises.adelphiabusiness.net
64.31.157.127	PTR	winkenterprises.adelphiabusiness.net
64.31.158.90	PTR	mail.smithandassociates.com
64.31.158.137	PTR	williamsonvermost.telcovebusiness.net
64.31.158.170	PTR	tampamail.mattstone.com
64.31.158.178	PTR	cpe-skyway-advisors.tc.mgmt.level3.net
64.31.158.210	PTR	trax.tpghotels.com
64.31.159.3	PTR	mail.elutions.com
64.31.159.35	PTR	mail.lxicomponents.com
64.31.159.66	PTR	server01.hydeparkbuilders.com
64.31.159.66	PTR	vpn.hydeparkbuilders.com
64.31.159.81	PTR	flaquarium.org
64.31.159.81	A	flaquarium.net
64.31.159.81	A	wahoo.flaquarium.org
64.31.159.82	PTR	jawfish.flaquarium.org
64.31.159.138	PTR	mail.tampabay.redcross.org
64.31.159.138	PTR	www.tampabay.redcross.org
64.31.159.139	PTR	mail.tampabay.redcross.org
64.31.159.139	PTR	www.tampabay.redcross.org
64.31.159.146	PTR	mail.transmarket.com
64.31.159.172	PTR	mail.lorenzen.ws
64.31.159.172	PTR	www.lorenzen.ws
64.31.159.174	PTR	mail.standarddemo.com
64.31.159.218	PTR	mail.unipresscorp.com