13.0.0.0/12

ip:	13.0.0.0 
loc:	United States, Norwalk (Connecticut)  
isp:	 » Xerox Corporation » Xerox Corporation 177.835 ms
route:	13.0.0.0/12, XEROX-NET - Xerox Corporation, US (Norwalk) ... 
reg:	13.0.0.0/12, US, ARIN, 1986-04-25
addr:	  201 Merritt 7 Norwalk CT 6851 US
online:	  306 » latency: 160 ms (222ms) 

see also:
   13.8.0.0/16      AS26662  XEROX-NET Xerox Corporation, US
   13.8.0.0/17      AS26662  XEROX-NET Xerox Corporation, US
   13.8.40.0/24     AS26662  XEROX-NET Xerox Corporation, US
   13.8.128.0/17    AS26662  XEROX-NET Xerox Corporation, US
   13.8.128.0/22    AS26662  XEROX-NET Xerox Corporation, US
   13.8.132.0/24    AS26662  XEROX-NET Xerox Corporation, US
   13.8.138.0/24    AS26662  XEROX-NET Xerox Corporation, US
   13.8.139.0/24    AS26662  XEROX-NET Xerox Corporation, US
   13.8.148.0/24    AS26662  XEROX-NET Xerox Corporation, US
   13.10.0.0/16     AS26662  XEROX-NET Xerox Corporation, US
   13.10.0.0/17     AS26662  XEROX-NET Xerox Corporation, US
   13.13.0.0/16     AS22390  XEROX-NET Xerox Corporation, US
   13.13.0.0/17     AS22390  XEROX-NET Xerox Corporation, US
   13.13.0.0/22     AS22390  XEROX-NET Xerox Corporation, US
   13.13.8.0/22     AS22390  XEROX-NET Xerox Corporation, US
   13.13.40.0/24    AS22390  XEROX-NET Xerox Corporation, US
   13.13.42.0/24    AS22390  XEROX-NET Xerox Corporation, US