Robtex

Up: 173.255.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 173.255.16.0/21
Down right: 173.255.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
173.255.16.0	PTR	173-255-16-0.ontera.net
173.255.16.34	PTR	34.16.255.173.in-arpa
173.255.16.34	A	mail.cochranetel.ca
173.255.16.34	A	mail.northernontariowires.com
173.255.16.35	PTR	35.16.255.173.in-arpa
173.255.16.35	A	www.northernontariowires.com
173.255.16.35	A	cochranetel.ca
173.255.16.178	PTR	178.16.255.173.in-arpa
173.255.16.178	A	mail.cgvbuilders.ca
173.255.16.189	A	mail.fortierbeverages.com
173.255.16.189	A	mail.fortierbeverages.ca
173.255.16.189	A	fortierbeverages.ca
173.255.16.195	A	mail.expeditioncampservice.com
173.255.16.195	A	2087121ontarioinc.com
173.255.16.195	A	mail.meridianfuels.com
173.255.18.208	PTR	208.18.255.173.in-arpa
173.255.21.47	A	goosdd.com
173.255.21.116	A	cochranego.com
173.255.21.220	A	zeor.ca
173.255.22.3	PTR	3.22.255.173.in-arpa
173.255.22.81	PTR	81.22.255.173.in-arpa
173.255.22.83	PTR	83.22.255.173.in-arpa
173.255.22.115	PTR	115.22.255.173.in-arpa
173.255.22.179	PTR	179.22.255.173.in-arpa
173.255.23.4	PTR	4.23.255.173.in-arpa
173.255.23.37	A	ctsvoip.ca
173.255.23.80	PTR	80.23.255.173.in-arpa
173.255.23.96	PTR	96.23.255.173.in-arpa
173.255.24.50	A	bobpecheur.com
173.255.24.50	A	bobfishing.com
173.255.24.57	PTR	ns1.abicom.ca
173.255.24.57	A	ns1.paroissevaldor.ca
173.255.24.60	PTR	mail.abicom.ca
173.255.24.60	A	mail.danychouinard.net
173.255.24.62	PTR	173-255-24-62.ontera.net
173.255.25.34	A	mail.weeneebaykohealth.ca
173.255.26.86	A	itsnb.ca
173.255.26.86	A	nhlnb.ca
173.255.26.111	A	mail.beezer.ca
173.255.28.53	A	tacticalraptor.com
173.255.28.95	A	696262.ru
173.255.30.6	PTR	abicom.ca
173.255.31.6	A	mail.cspne.ca