12.72.72.0/22

ip:	12.72.72.0 
loc:	United States, Everett (Washington)  
isp:	AS20057 AT&T Enterprises, LLC » AT&T Enterprises » AT&T Worldnet Services 766.947 ms
route:	12.72.72.0/22, AT&T Enterprises - AT&T Worldnet Services, US ... 
reg:	12.0.0.0/8, US, ARIN, 1983-08-23
asn:	AS20057 - ATT-MOBILITY-LLC-AS20057 AT&T Wireless Service, US
addr:	  
online:	  2 » latency: 90 ms (90ms) 

see also:
   12.0.0.0/8       AS7018   ATT AT&T Enterprises, LLC, US
   12.0.0.0/9       AS7018   ATT AT&T Enterprises, LLC, US
   12.72.0.0/17     AS20057  ATTSVC-12-72-0-0 AT&T Worldnet Services, US