Robtex

Up: 66.102.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.102.13.0/25
Down right: 66.102.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.102.13.0	A+PTR	0.13.102.66.bc.googleusercontent.com
66.102.13.14	A+PTR	14.13.102.66.bc.googleusercontent.com
66.102.13.17	A+PTR	17.13.102.66.bc.googleusercontent.com
66.102.13.18	A	18.13.102.66.bc.googleusercontent.com
66.102.13.44	A+PTR	44.13.102.66.bc.googleusercontent.com
66.102.13.69	A	69.13.102.66.bc.googleusercontent.com
66.102.13.86	A	86.13.102.66.bc.googleusercontent.com
66.102.13.91	A+PTR	91.13.102.66.bc.googleusercontent.com
66.102.13.93	A+PTR	93.13.102.66.bc.googleusercontent.com
66.102.13.95	PTR	95.13.102.66.bc.googleusercontent.com
66.102.13.97	PTR	97.13.102.66.bc.googleusercontent.com
66.102.13.99	A+PTR	99.13.102.66.bc.googleusercontent.com
66.102.13.99	A	xn--gpfert-wxa.de
66.102.13.99	A	goepfert.it
66.102.13.100	A+PTR	100.13.102.66.bc.googleusercontent.com
66.102.13.101	A	101.13.102.66.bc.googleusercontent.com
66.102.13.102	A+PTR	102.13.102.66.bc.googleusercontent.com
66.102.13.103	A+PTR	103.13.102.66.bc.googleusercontent.com
66.102.13.104	A+PTR	104.13.102.66.bc.googleusercontent.com
66.102.13.104	A	explorenewvisions.com
66.102.13.105	PTR	105.13.102.66.bc.googleusercontent.com
66.102.13.105	A	hun.ro
66.102.13.106	A+PTR	106.13.102.66.bc.googleusercontent.com
66.102.13.106	A	grandcentrix.me
66.102.13.113	A+PTR	113.13.102.66.bc.googleusercontent.com
66.102.13.118	A+PTR	118.13.102.66.bc.googleusercontent.com
66.102.13.121	PTR	121.13.102.66.bc.googleusercontent.com
66.102.13.121	A	p-s-y-c-h-o-l-o-g.cz
66.102.13.121	A	jufmirjam.nl
66.102.13.138	A	138.13.102.66.bc.googleusercontent.com
66.102.13.139	A+PTR	139.13.102.66.bc.googleusercontent.com
66.102.13.142	A	142.13.102.66.bc.googleusercontent.com
66.102.13.143	PTR	143.13.102.66.bc.googleusercontent.com
66.102.13.210	PTR	210.13.102.66.bc.googleusercontent.com
66.102.13.226	A+PTR	226.13.102.66.bc.googleusercontent.com