Robtex

Up: 74.81.180.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 74.81.181.0/25
Down right: 74.81.181.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
74.81.181.1	PTR	cloud-181-1-gw.caro.net
74.81.181.25	PTR	g25.engagemodel.com.br
74.81.181.25	A	c25.quero.mildesscontos.com.br
74.81.181.89	A	ns3.power1.com
74.81.181.97	PTR	calyptix-1.caro.net
74.81.181.98	PTR	calyptix-2.caro.net
74.81.181.99	PTR	calyptix-3.caro.net
74.81.181.100	PTR	calyptix-318-100.caro.net
74.81.181.100	A	ingest.sam.calyptix.com
74.81.181.101	PTR	prod.calyptix.com
74.81.181.101	A	payments.calyptix.com
74.81.181.102	PTR	calyptix-318-102.caro.net
74.81.181.103	PTR	calyptix-318-103.caro.net
74.81.181.104	PTR	calyptix-318-104.caro.net
74.81.181.105	PTR	calyptix-318-105.caro.net
74.81.181.105	A	ns1.calyptix.com
74.81.181.106	PTR	calyptix-318-106.caro.net
74.81.181.107	PTR	calyptix-318-107.caro.net
74.81.181.108	PTR	calyptix-318-108.caro.net
74.81.181.109	PTR	calyptix-318-109.caro.net
74.81.181.109	A	dhaas.calyptix.com
74.81.181.110	PTR	calyptix-318-110.caro.net
74.81.181.110	A	online.calyptix.com
74.81.181.111	PTR	calyptix-318-111.caro.net
74.81.181.112	PTR	calyptix-318-112.caro.net
74.81.181.113	PTR	calyptix-318-113.caro.net
74.81.181.114	PTR	calyptix-318-114.caro.net
74.81.181.115	PTR	calyptix-318-115.caro.net
74.81.181.116	PTR	calyptix-318-116.caro.net
74.81.181.117	PTR	calyptix-318-117.caro.net
74.81.181.118	PTR	calyptix-318-118.caro.net
74.81.181.119	PTR	calyptix-318-119.caro.net
74.81.181.120	PTR	calyptix-318-120.caro.net
74.81.181.121	PTR	calyptix-318-121.caro.net
74.81.181.122	PTR	calyptix-318-122.caro.net
74.81.181.123	PTR	calyptix-318-123.caro.net
74.81.181.124	PTR	calyptix-318-124.caro.net
74.81.181.124	A	devio.us
74.81.181.125	A+PTR	mail.calyptix.com
74.81.181.126	PTR	gw.calyptix.com
74.81.181.129	PTR	gw2-1.zerolag.com
74.81.181.180	PTR	harolds-lan-180.caro.net
74.81.181.180	A	1h4m.com
74.81.181.180	A	mx.seamanage.net
74.81.181.181	A	ibtreatments.com
74.81.181.194	A	ns1.kickingroo.com
74.81.181.195	PTR	available-181-195.firstnetworksouth.com
74.81.181.195	A	ns2.kickingroo.com
74.81.181.212	A	dev2.kickingroo.com
74.81.181.214	A	travelnursehousing.net
74.81.181.214	A	furnishedfinder.net
74.81.181.217	PTR	available-181-217.rdoservers.com
74.81.181.217	A	repoussetools.com
74.81.181.217	A	mail.anvilfire.com
74.81.181.218	PTR	available-181-218.rdoservers.com
74.81.181.218	A	www.flypress.com
74.81.181.218	A	mail.forginghammers.info
74.81.181.220	A	itusco.com
74.81.181.235	PTR	scr-181-235.caro.net
74.81.181.236	PTR	scr-181-236.caro.net