Robtex

Up: 216.105.250.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.105.250.0/25
Down right: 216.105.250.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.105.250.20	A	unicamail.investools.com
216.105.250.40	A+PTR	nsara-ct.tdameritrade.com
216.105.250.41	A	associate.tdameritrade.com
216.105.250.42	A	smail.ameritrade.com
216.105.250.70	A+PTR	nsglba-ct.tdameritrade.com
216.105.250.71	PTR	poc-access.tdameritrade.com
216.105.250.71	A	remoteaccess.tdameritrade.com
216.105.250.113	A	demo.advisorservices.com
216.105.250.173	A	apiext-ste0.tdameritrade.com
216.105.250.180	A+PTR	sip.investools.com
216.105.250.180	PTR	sip.thinkorswim.com
216.105.250.180	A+PTR	sip.ameritrade.com
216.105.250.181	A+PTR	sip-ct.tdameritrade.com
216.105.250.181	A+PTR	sip.tdameritrade.com
216.105.250.181	A	sip.ameritrade.com