Robtex

Up: 74.121.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 74.121.0.0/23
Down right: 74.121.2.0/23

IP	Type	Hostname
74.121.0.0	A+PTR	net-74-121-0.actusa.net
74.121.0.6	PTR	rescue.actusa.net
74.121.0.6	A	secure.actusa.net
74.121.0.28	PTR	www.codercommunications.com
74.121.0.28	A	codercommunications.com
74.121.0.28	A	codertelecom.com
74.121.0.40	A	penguincompatible.com
74.121.0.226	A	namedhost.actusa.net
74.121.1.0	PTR	net-74-121-1.actusa.net
74.121.1.197	A	garethgreenaway.net
74.121.3.0	A+PTR	net-74-121-3.actusa.net
74.121.3.255	PTR	broadcast-74-121-3.actusa.net