Robtex

Up: 139.171.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 139.171.0.0/20
Down right: 139.171.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
139.171.1.1	A+PTR	secure.msen.net
139.171.26.88	A	mail.montanasbestdeals.com
139.171.26.88	A	mail.thompsonwasik.com
139.171.26.88	A	mail.ilovelegacy.com
139.171.30.2	PTR	webmail.sacc.com
139.171.30.3	PTR	ewpdesign.com