Robtex

Up: 50.115.218.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 50.115.219.0/25
Down right: 50.115.219.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
50.115.219.77	A+PTR	mta77d9.r.grouponmail.ca
50.115.219.78	A+PTR	mta78d9.r.grouponmail.ca
50.115.219.79	A+PTR	mta79d9.r.grouponmail.ca
50.115.219.111	A+PTR	mta111d9.r.grouponmail.com.au
50.115.219.113	A+PTR	mta113d9.r.grouponmail.com.au
50.115.219.115	A+PTR	mta115d9.r.grouponmail.com.au
50.115.219.122	A+PTR	mta122d9.r.grouponmail.com.au
50.115.219.158	A+PTR	mta158d9.r.grouponmail.hk
50.115.219.254	A	grouponmail.co.za
50.115.219.254	A	r.grouponmail.com
50.115.219.254	A	r.grouponmail.hk