Looking at the source it seems it's hitting reserved IP's. I guess this is correct as the rtg servers are on the internal network for all I know.
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<A href="rtg_detail.html?graph_machine=172.16.214.24&iid=1003306&ip_table=172_16_211_146&date_string=200406&deploy_date=03082004" class="aOrange">RTG Graphs</a> | <A href="/powerstat.html?report=M&date_string=006-01-2004&iid=1003306&gserver=172.16.214.24" class="aOrange">PowerStat Graphs</a>
<A href="rtg_detail.html?graph_machine=10.0.2.15&iid=1136&ip_table=UNKNOWN&date_string=200406&deploy_date=06042004" class="aOrange">RTG Graphs</a> |
<A href="/powerstat.html?report=M&date_string=006-01-2004&iid=1136&gserver=10.0.2.15" class="aOrange">PowerStat Graphs</a>