Robtex

Up: 209.172.72.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 209.172.72.0/25
Down right: 209.172.72.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
209.172.72.63	A	209-172-72-63.static-ip.telepacific.net
209.172.72.138	A+PTR	209-172-72-138.static-ip.telepacific.net
209.172.72.138	A	jimandkristin.org
209.172.72.138	A	tweetalogue.com
209.172.72.147	A	mx1.optiscancorp.com
209.172.72.157	A	209-172-72-157.static-ip.telepacific.net
209.172.72.166	A+PTR	209-172-72-166.static-ip.telepacific.net
209.172.72.254	A	209-172-72-254.static-ip.telepacific.net