identifying ASN

With all this talk of tracing attacks I just noticed that whois -h whois.arin.net seems to not be as informative as it used to be. When looking up various ASN I sometimes get the information I want, but frequently I get: Sorry, you shouldn't see this record. or No match for ASN "..." (Sample ASes are 2855, 5400, 9057, 11486) Did I miss some policy change? -mark P.S. Fortunately, various radb-like entities still list information for a lot of ASes.