Robtex

Up: 209.173.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 209.173.139.0/25
Down right: 209.173.139.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
209.173.139.2	A	sparkactivitytracker.com
209.173.139.2	A	babyfit.com
209.173.139.2	A	sparkamerica.com
209.173.139.11	A	da1.cincinnati.fasterping.com
209.173.139.48	A	slow-play.net
209.173.139.102	A+PTR	smtp102.sparkpeople.com
209.173.139.144	A	spam.pbflex.com
209.173.139.243	PTR	ip.immedion.net
209.173.139.243	A	sparksavings.com
209.173.139.243	A	sparkcoach.com
209.173.139.251	A	pbflex.com
209.173.139.251	A	mx8.smtp.pbflex.com