Robtex

Up: 139.124.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 139.125.0.0/17
Down right: 139.125.128.0/17

IP	Type	Hostname
139.125.0.0	PTR	nothing.attdns.com
139.125.35.17	PTR	nothing.attdns.com
139.125.39.83	PTR	nothing.attdns.com
139.125.39.139	PTR	nothing.attdns.com
139.125.103.19	PTR	nothing.attdns.com
139.125.103.27	PTR	nothing.attdns.com
139.125.103.130	PTR	nothing.attdns.com
139.125.122.208	PTR	nothing.attdns.com
139.125.239.151	PTR	nothing.attdns.com