Robtex

Up: 192.139.6.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.139.6.0/25
Down right: 192.139.6.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.139.6.2	A+PTR	s-edm-susa.nofc.cfs.nrcan.gc.ca
192.139.6.30	PTR	s-edm-leto.nofc.cfs.nrcan.gc.ca
192.139.6.34	PTR	s-edm-ceto.nofc.cfs.nrcan.gc.ca
192.139.6.68	A+PTR	s-edm-bartok.nofc.cfs.nrcan.gc.ca
192.139.6.68	A	bookstore.cfs.nrcan.gc.ca
192.139.6.68	A	cfs.nrcan.gc.ca
192.139.6.151	A	hvac.nofc.cfs.nrcan.gc.ca
192.139.6.180	A+PTR	p-edm-ash.nofc.cfs.nrcan.gc.ca