12.72.64.0/22

ip:	12.72.64.0 
loc:	United States, Everett (Washington)  
isp:	AS20057 AT&T Enterprises, LLC » AT&T Enterprises » AT&T Worldnet Services 591.374 ms
route:	12.72.64.0/22, ATTSVC-12-72-0-0 - AT&T Worldnet Services, US (Miami) ... 
reg:	12.0.0.0/8, US, ARIN, 1983-08-23
asn:	AS20057 - ATT-MOBILITY-LLC-AS20057 AT&T Wireless Service, US
addr:	  412 Mount Kemble Ave. P.O. Box 1995 Morristown NJ 7962 US
online:	  102 » latency: 243 ms (243ms) 

see also:
   12.0.0.0/8       AS7018   NET12 American Registry for Internet Numbers, US
   12.0.0.0/9       AS7018   NET12 American Registry for Internet Numbers, US
   12.72.0.0/17     AS20057  ATTSVC-12-72-0-0 AT&T Worldnet Services, US