136.48.0.0/20

ip:	136.48.0.0 136-48-0-0.dsm.googlefiber.net
loc:	United States, Des Moines (Iowa)  
isp:	AS16591 Google Fiber Inc. » Google Fiber Inc. » Google Fiber 368.645 ms
route:	136.48.0.0/20, GFIBER-V4 - Google Fiber Inc., US (Des Moines) ... 
reg:	136.32.0.0/11, US, ARIN, 2015-10-06
asn:	AS16591 - GOOGLE-FIBER Google Fiber Inc., US
	  AS3356  - LEVEL3 Level 3 Parent, LLC, US
addr:	  1600 Amphitheatre Parkway Mountain View CA 94043 US
online:	  1.391 » latency: 145 ms (176ms) 

see also:
   136.32.0.0/11    AS16591  GOOGLE-FIBER Google Fiber Inc., US