Robtex

Up: 209.63.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 209.63.42.0/25
Down right: 209.63.42.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
209.63.42.0	A+PTR	client0.mainstreamdata.com
209.63.42.4	PTR	client4.mainstreamdata.com
209.63.42.5	A	qadevgw1.mainstreamdata.com
209.63.42.20	A+PTR	mail.passeys.com.mainstreamdata.com
209.63.42.20	A	mail.passeys.com
209.63.42.20	A	passeys.com
209.63.42.21	A+PTR	ns1.mainstreamdata.com
209.63.42.21	A	ns1.reutershealth.com
209.63.42.21	A	ns1.uniphotopress.com
209.63.42.22	PTR	ns2.mainstreamdata.com
209.63.42.22	A	ns2.akmgsi.com
209.63.42.22	A	ns2.uniphotopress.com
209.63.42.23	A	client23.mainstreamdata.com
209.63.42.25	A+PTR	smtp.mainstreamdata.com
209.63.42.28	A+PTR	client28.mainstreamdata.com
209.63.42.28	A	e-mediacon.org
209.63.42.28	A	mainstreamchina.com
209.63.42.29	A+PTR	mainstreamdata.com
209.63.42.29	A	s8.123ssh.net
209.63.42.30	A+PTR	client30.mainstreamdata.com
209.63.42.30	A	mainstreaminternational.co.uk
209.63.42.30	A	newscomcelebrity.com
209.63.42.35	A	webmail.mainstreamdata.com
209.63.42.50	A+PTR	accessftp05.mainstreamdata.com
209.63.42.52	A	gsiftpdrop.mainstreamdata.com
209.63.42.61	A+PTR	bloomberg.mainstreamdata.com
209.63.42.61	A	newscontentsource.com
209.63.42.64	PTR	simftp.mainstreamdata.com
209.63.42.66	A	client66.mainstreamdata.com
209.63.42.70	A+PTR	splashvideo.mainstreamdata.com
209.63.42.70	A	splash-video.com
209.63.42.71	PTR	splashvideo2.mainstreamdata.com
209.63.42.87	A+PTR	smb.mainstreamdata.com
209.63.42.94	PTR	client94.mainstreamdata.com
209.63.42.100	PTR	client100.mainstreamdata.com
209.63.42.100	A	guardian.mainstreamdata.com
209.63.42.110	A+PTR	splash.mainstreamdata.com
209.63.42.113	A+PTR	reutershealth.mainstreamdata.com
209.63.42.113	A	www.reutershealth.com
209.63.42.113	A	reutershealth.com
209.63.42.122	A	mediasnet02.mainstreamdata.com
209.63.42.123	A	mediasnet03.mainstreamdata.com
209.63.42.124	A	mediasnet05.mainstreamdata.com
209.63.42.129	A+PTR	client129.mainstreamdata.com
209.63.42.129	A	photos.prn.mainstreamdata.com
209.63.42.129	A	photos.prnewswire.com
209.63.42.132	PTR	pa.mainstreamdata.com
209.63.42.132	A	www.mainstreamdata.com
209.63.42.137	A+PTR	mapps01.mainstreamdata.com
209.63.42.137	A	ginsburgspalyinc.mainstreamdata.com
209.63.42.137	A	akmgsimedia.com
209.63.42.138	A+PTR	mapps02.mainstreamdata.com
209.63.42.138	A	www.uniphotopress.com
209.63.42.138	A	uniphotopress.com
209.63.42.145	A	gsi.mainstreamdata.com
209.63.42.145	A	gsimb.mainstreamdata.com
209.63.42.175	A	client175.mainstreamdata.com
209.63.42.176	PTR	client176.mainstreamdata.com
209.63.42.176	A	instarvideo.com
209.63.42.176	A	na.mediashowroom.com
209.63.42.178	PTR	client178.mainstreamdata.com
209.63.42.190	PTR	client190.mainstreamdata.com
209.63.42.201	A+PTR	nexus1.mainstreamdata.com
209.63.42.236	PTR	client236.mainstreamdata.com
209.63.42.245	PTR	client245.mainstreamdata.com
209.63.42.254	A	client254.mainstreamdata.com
209.63.42.255	A+PTR	client255.mainstreamdata.com