Robtex

Up: 64.190.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 64.190.128.0/22
Down right: 64.190.132.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.190.128.130	PTR	130.128.190.64.in-addr.arpa
64.190.129.10	PTR	10.129.190.64.in-addr.arpa
64.190.129.10	A	c4voicemail.com
64.190.129.10	A	c2voicemail.net
64.190.130.8	PTR	8.130.190.64.in-addr.arpa
64.190.130.9	PTR	9.130.190.64.in-addr.arpa
64.190.130.10	PTR	10.130.190.64.in-addr.arpa
64.190.130.18	PTR	18.130.190.64.in-addr.arpa
64.190.130.24	PTR	24.130.190.64.in-addr.arpa
64.190.130.48	PTR	48.130.190.64.in-addr.arpa
64.190.130.51	PTR	51.130.190.64.in-addr.arpa
64.190.130.56	PTR	56.130.190.64.in-addr.arpa
64.190.130.57	PTR	57.130.190.64.in-addr.arpa
64.190.130.58	PTR	58.130.190.64.in-addr.arpa
64.190.130.73	PTR	73.130.190.64.in-addr.arpa
64.190.130.75	PTR	75.130.190.64.in-addr.arpa
64.190.130.82	PTR	82.130.190.64.in-addr.arpa
64.190.130.88	PTR	88.130.190.64.in-addr.arpa
64.190.130.120	PTR	120.130.190.64.in-addr.arpa
64.190.130.122	PTR	122.130.190.64.in-addr.arpa
64.190.130.154	PTR	154.130.190.64.in-addr.arpa
64.190.130.160	PTR	160.130.190.64.in-addr.arpa
64.190.130.161	PTR	161.130.190.64.in-addr.arpa
64.190.130.171	PTR	171.130.190.64.in-addr.arpa
64.190.130.179	PTR	179.130.190.64.in-addr.arpa
64.190.130.184	PTR	184.130.190.64.in-addr.arpa
64.190.130.185	PTR	185.130.190.64.in-addr.arpa
64.190.130.200	PTR	200.130.190.64.in-addr.arpa
64.190.130.202	PTR	202.130.190.64.in-addr.arpa
64.190.130.203	PTR	203.130.190.64.in-addr.arpa
64.190.130.234	PTR	234.130.190.64.in-addr.arpa
64.190.130.243	PTR	243.130.190.64.in-addr.arpa
64.190.131.78	PTR	78.131.190.64.in-addr.arpa
64.190.131.102	PTR	102.131.190.64.in-addr.arpa
64.190.132.10	PTR	64-190-132-10.static.cypresscom.net
64.190.132.10	A	mail.calpian.net
64.190.132.10	A	mail.checktronic.com
64.190.132.66	PTR	66.132.190.64.in-addr.arpa
64.190.132.130	PTR	130.132.190.64.in-addr.arpa
64.190.132.130	A	honeypot.cypresscom.net
64.190.132.146	PTR	64-190-132-146.static.cypresscom.net
64.190.132.146	A	mail.saberdrilling.com
64.190.132.146	A	mail.saberindustrieslp.com
64.190.133.90	PTR	90.133.190.64.in-addr.arpa
64.190.133.114	PTR	114.133.190.64.in-addr.arpa
64.190.134.106	A	mail.headingtonhotels.com
64.190.134.188	PTR	188.134.190.64.in-addr.arpa
64.190.134.226	A	mail.theelitealliance.com
64.190.134.245	A	mail1.textrial.com
64.190.135.3	PTR	3.135.190.64.in-addr.arpa
64.190.135.23	A	mail.hwcc.com
64.190.135.99	A	mail.garfieldtraub.com