Robtex

Up: 208.84.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.84.136.0/23
Down right: 208.84.138.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.84.136.4	A	vpn.dentonisd.org
208.84.136.248	A	oldvpn.dentonisd.org
208.84.136.253	A	ns1.dentonisd.org
208.84.136.254	A	ns2.dentonisd.org
208.84.137.18	A	food.dentonisd.org
208.84.137.52	A+PTR	gradespeed.dentonisd.org
208.84.137.54	A+PTR	denhac2.dentonisd.org
208.84.137.87	PTR	ironportesa1.dentonisd.org
208.84.137.87	A+PTR	mail.dentonisd.org
208.84.137.110	A	eduphoria.dentonisd.org
208.84.137.111	A	cnvp.dentonisd.org
208.84.137.151	A+PTR	exhub.dentonisd.org
208.84.137.151	A+PTR	owa.dentonisd.org
208.84.137.155	A	swimblog.dentonisd.org
208.84.137.155	A	auction.dentonisd.org
208.84.137.155	A	dhsorchestra.dentonisd.org
208.84.137.156	A	opac.dentonisd.org
208.84.138.99	A	classworks.dentonisd.org
208.84.138.101	A	denhac.dentonisd.org
208.84.138.105	A	www.dentonisd.org
208.84.138.106	A	g.dentonisd.org
208.84.138.107	A	ns2.dentonisd.org
208.84.138.108	A	ns3.dentonisd.org
208.84.138.125	A	sso.dentonisd.org
208.84.138.125	A	careline.dentonisd.org
208.84.138.126	A	bus.dentonisd.org
208.84.139.254	A	ns3.dentonisd.org