Robtex

Up: 216.163.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.163.48.0/23
Down right: 216.163.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.163.48.51	A	lost-end.qtm.net
216.163.48.110	PTR	open.sdsl-bridged.qtm.net
216.163.48.130	PTR	idsl.allegiantair.qtm.net
216.163.48.131	PTR	open
216.163.48.134	PTR	idsl.midwestappr.qtm.net
216.163.48.143	PTR	open
216.163.48.158	PTR	idsl.tylerautomotive.qtm.net
216.163.48.159	PTR	open
216.163.48.168	PTR	open
216.163.48.189	PTR	open
216.163.48.196	PTR	open
216.163.48.202	PTR	idsl.centurysmallbusiness.qtm.net
216.163.48.211	PTR	open
216.163.48.223	PTR	open.idsl.qtm.net
216.163.48.225	PTR	open.idsl.qtm.net
216.163.48.230	PTR	open.idsl.qtm.net
216.163.48.242	PTR	open.idsl.qtm.net
216.163.48.251	PTR	open.idsl.qtm.net
216.163.49.9	A	clearchoice1.qtm.net
216.163.49.10	A	clearchoice2.qtm.net
216.163.49.11	A	clearchoice3.qtm.net
216.163.49.12	A	clearchoice4.qtm.net
216.163.49.13	A+PTR	clearchoice5.qtm.net
216.163.49.14	A+PTR	clearchoice6.qtm.net
216.163.49.51	PTR	idsl.pac.qtm.net
216.163.49.107	PTR	216-163-49-107.static.acd.net
216.163.49.124	PTR	host1.deltamach.com
216.163.49.143	PTR	lost-end.qtm.net
216.163.49.148	PTR	mail.ctd1.com
216.163.49.152	A	lost-start.siemans.qtm.net
216.163.49.153	PTR	serial-gr.siemans.qtm.net
216.163.49.154	A	router.siemans.qtm.net
216.163.49.155	A	lost-end.siemans.qtm.net
216.163.49.159	PTR	lost-end.bandl.qtm.net
216.163.49.196	PTR	secure.lorysplace.org
216.163.49.199	PTR	216-163-49-199.static.acd.net
216.163.49.206	PTR	reserved-securessl.qtm.net
216.163.49.211	PTR	reserved-securessl.qtm.net
216.163.49.219	PTR	216-163-49-219.static.acd.net
216.163.49.236	PTR	reserved-securessl.qtm.net
216.163.49.245	PTR	reserved-securessl.qtm.net
216.163.50.6	PTR	2.computerassistant.qtm.net
216.163.50.45	PTR	mail.duramold.net
216.163.50.122	A	email.christmanco.com
216.163.50.149	PTR	open
216.163.50.151	PTR	open
216.163.50.179	PTR	lost-end.cullar-sdsl.qtm.net
216.163.50.254	PTR	open
216.163.51.30	PTR	mail.heraldpalladium.com
216.163.51.50	A	katiejporter.com
216.163.51.50	A	katiejporter.net
216.163.51.50	A	kjporter.net
216.163.51.98	A	area51.alienz.net
216.163.51.102	A	eugr.com
216.163.51.125	A	mail.wipuppymillproject.com
216.163.51.125	A	mail.e-craftshow.com
216.163.51.125	A	e-craftshow.com