Robtex

Up: 206.123.20.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 206.123.20.0/24
Down right: 206.123.21.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
206.123.20.0	PTR	safe-netblk1
206.123.20.1	A+PTR	dns1.safe.ca
206.123.20.1	A	dns1.horizonvertgie.com
206.123.20.1	A	dns1.clemsafe.net
206.123.20.34	A+PTR	dnsref3.safe.ca
206.123.20.34	A	arendal.safe.ca
206.123.20.34	A	cma-montreal.ca
206.123.20.42	PTR	hamar.safe.ca
206.123.20.43	A+PTR	dns2uplink.safe.ca
206.123.20.55	A	orkdal.safe.ca
206.123.20.60	PTR	el5-i386.safe.ca
206.123.20.69	A+PTR	prod1.safe.ca
206.123.20.70	A+PTR	prod2.clemsafe.net
206.123.20.70	A	mail.fipcam.com
206.123.20.70	A	www.safe.ca
206.123.20.95	A+PTR	news1.safe.ca
206.123.20.101	PTR	regdemo1.safe.ca
206.123.20.102	A	regdemo2.safe.ca
206.123.20.104	A	regdemo4.safe.ca
206.123.20.245	A	pretoria.safe.ca
206.123.20.249	A+PTR	berlin.safe.ca
206.123.20.254	PTR	northbay.safe.ca
206.123.20.254	A	pretoria.safe.ca
206.123.21.1	A+PTR	dns2.safe.ca
206.123.21.1	A	dns2.horizonvertgie.com
206.123.21.1	A	dns2.clemsafe.net
206.123.21.36	A	frantzcy.safe.ca
206.123.21.36	A	angelone.paisible.com
206.123.21.37	PTR	host1.ccit.safe.ca
206.123.21.37	A	ccit.safe.ca
206.123.21.37	A	www.ccit.tg
206.123.21.38	PTR	outdoors.safe.ca
206.123.21.38	PTR	host1.outdoors.safe.ca
206.123.21.38	A	outdoorsmanads.net
206.123.21.42	A	cm01.safe.ca
206.123.21.42	A	geneve.safe.ca
206.123.21.43	PTR	host1up4.safe.ca
206.123.21.43	PTR	host1up4.host1up.com
206.123.21.43	A	dinnersready.cc
206.123.21.44	A	mailuplink1.safe.ca
206.123.21.44	A	mx1.belin.qc.ca
206.123.21.45	A+PTR	mailuplink.safe.ca
206.123.21.45	A+PTR	mail.up-link.net
206.123.21.48	A	www.dellux.ca
206.123.21.48	A	webcust1.safe.ca
206.123.21.48	A	www.cma-montreal.ca
206.123.21.49	PTR	ftp.safe.ca
206.123.21.49	A+PTR	git.safe.ca
206.123.21.50	A	nyon.safe.ca
206.123.21.53	A	americaninterplex.com
206.123.21.56	A	host1up5.safe.ca
206.123.21.61	A+PTR	free.safe.ca
206.123.21.84	PTR	lachute.safe.ca
206.123.21.121	PTR	oslo.safe.ca
206.123.21.145	A	ctard-fw3.couche-tard.qc.ca
206.123.21.193	PTR	host1up7.safe.ca
206.123.21.193	A+PTR	host1up7.host1up.com
206.123.21.193	A	mail.hollandchapel.org
206.123.21.194	A+PTR	host1up8.safe.ca
206.123.21.194	PTR	host1up8.host1up.com
206.123.21.194	A	stevenblackwood.com
206.123.21.198	A+PTR	bentonschools1.host1up.com
206.123.21.198	A	ww2.bentonschools.org
206.123.21.198	A	uplinktest.com
206.123.21.199	A+PTR	free.safe.ca