Robtex

Up: 209.191.224.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 209.191.224.0/22
Down right: 209.191.228.0/22

IP	Type	Hostname
209.191.228.68	A	vpn.kcg.com
209.191.228.69	A	ftp2.knighttrading.com
209.191.228.71	A	pr1wssmt03.knighttrading.com
209.191.228.72	A	pr1mx03.knighttrading.com
209.191.228.130	A	prgw1.knighttrading.com
209.191.228.168	A+PTR	ns2.kcg.com
209.191.228.168	PTR	ns2.knight.com
209.191.228.168	A	ns2.knighttrading.com
209.191.228.169	PTR	209-191-228-169.knight.com
209.191.228.175	A	pr1lkdmdbeta2.knight.com
209.191.228.182	A	mustangbetapr1.knight.com
209.191.228.183	A	pr1lnpmd2.knight.com
209.191.228.184	A	pr1lnpmd4.knight.com
209.191.228.185	A	pr1lhttpstage2.knight.com
209.191.228.187	A	pr1lmust2.knight.com
209.191.228.188	A	pr1lmust4.knight.com
209.191.230.37	A	ns1.kernelhosting.in
209.191.231.25	A	dr.bexdata.com
209.191.231.195	A	demo.nite-phd.com