205.246.72.0/21

ip:	205.246.72.0 
loc:	United States, Ashburn (Virginia)  
isp:	AS6079 RCN » RCN » RCN 752.175 ms
route:	205.246.72.0/21, SPRINT-BLKF - Sprint, US (Secaucus) ... 
reg:	205.240.0.0/13, US, ARIN, 1995-04-24
asn:	AS6062 - NETPLEX NETPLEX, US
	  AS26410 - PTPA Point To Point Access.Com, US
addr:	  2450 N Street NW Washington DC 20037 US
online:	  1 » latency: 107 ms (107ms) 

see also:
   205.240.0.0/13   AS174    SPRINT-BLKF Sprint, US