Robtex

Up: 209.42.52.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 209.42.52.0/24
Down right: 209.42.53.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
209.42.52.3	PTR	static.user3.209.42.52.dsli.com
209.42.52.4	PTR	static.user4.209.42.52.dsli.com
209.42.52.5	PTR	static.user5.209.42.52.dsli.com
209.42.52.7	PTR	static.user7.209.42.52.dsli.com
209.42.52.10	PTR	static.user10.209.42.52.dsli.com
209.42.52.26	A	ah.pciicp.com
209.42.52.46	PTR	thespeargroup.com
209.42.52.50	A+PTR	static.user50.209.42.52.dsli.com
209.42.52.59	A+PTR	static.user59.209.42.52.dsli.com
209.42.52.101	A	static.user101.209.42.52.dsli.com
209.42.52.172	PTR	static.user172.209.42.52.dsli.com
209.42.53.6	A	mail.deguardiola.com
209.42.53.7	PTR	static.user7.209.42.53.dsli.com
209.42.53.30	A	webmail.ringemann.com
209.42.53.32	A+PTR	static.user32.209.42.53.dsli.com
209.42.53.52	PTR	host-209-42-53-52.reverse.opticaltel.com
209.42.53.52	A	northbell.us
209.42.53.52	A	sip1.northbell.net
209.42.53.53	A	mail.microtel.net
209.42.53.54	A	mail2.northbell.net
209.42.53.54	A	static.user54.209.42.53.dsli.com
209.42.53.54	A	mail2.caricogroup.com
209.42.53.60	PTR	static.user60.209.42.53.northbell.net
209.42.53.60	A	mail2.caricogroup.com
209.42.53.60	A	mail.caricogroup.com
209.42.53.62	PTR	host-209-42-53-62.reverse.opticaltel.com
209.42.53.62	A	mail.caricogroup.com
209.42.53.62	A	mail.northbell.net
209.42.53.78	PTR	static.user78.209.42.53.dsli.com
209.42.53.83	PTR	static.user83.209.42.53.dsli.com
209.42.53.96	A	static.user96.209.42.53.dsli.com
209.42.53.119	A	gwpartners.biz
209.42.53.192	A	static.user192.209.42.53.dsli.com
209.42.53.205	PTR	sealtite.com
209.42.53.215	A	gw.kcl.net
209.42.53.236	PTR	sixls.com