172.56.2.0/23

ip:	172.56.2.0 
loc:	United States, Hyattsville (Maryland)  
isp:	AS21928 T-Mobile USA, Inc. » T-Mobile USA, Inc. » T-Mobile USA, Inc. 507.469 ms
route:	172.56.2.0/23, TMO9 - T-Mobile USA, Inc., US (Baltimore) ... 
reg:	172.32.0.0/11, US, ARIN, 2012-09-18
asn:	AS21928 - T-MOBILE-AS21928 T-Mobile USA Inc., US
	  AS174   - COGENT-174 Cogent Communications, US
addr:	  12920 SE 38th Street Bellevue WA 98006 US
online:	  1 » latency: 337 ms (337ms) 

see also:
   172.32.0.0/11    AS21928  TMO9 T-Mobile USA, Inc., US
   172.56.0.0/16    AS21928  TMO9 T-Mobile USA, Inc., US