www.worldnet.att.net routing problems

Does anyone have information why ATT's Worldnet portal is being
routed through Splitrock, UIUC and NCSA? It seems to have pretty
much taken the Worldnet site off the net.

nslookup www.worldnet.att.net

Server: localhost

Non-authoritative answer:
Name: www.worldnet.att.net

route-views.oregon-ix.net>show ip bgp
BGP routing table entry for, version 4137919
Paths: (1 available, best #1)
  Advertised to non peer-group peers:
  1224 38 10514 7018 5731, (aggregated by 5731 from (
      Origin IGP, localpref 100, valid, external, atomic-aggregate, best