[consult] Additional background information
info at arin.net
Wed Mar 14 10:44:59 EDT 2007
The introductory post to consult at arin.net on this topic,
that the ARIN WHOIS query limit of 256 results has been in place since
ARIN's inception as a means of curtailing data mining. As noted on the
WHOIS help page, http://ws.arin.net/whois, queries that return more
than 256 results will stop displaying data after the 256th result.
This arbitrary limit was put in place both to control data mining and to
avoid undue server and bandwidth strain. An example illustrating the
need for some type of limit is the query of "! n net-*". Without a
limit, the result will be all 1.5+ million network records. Current
functionality truncates it after the first 256 records.
In addition to truncating results, there is a query rate limiter in
place to prevent excessive querying by a single IP address during a
prescribed period of time.
Regarding other RIRs, RIPE WHOIS and AfriNIC WHOIS truncate responses
at 300 records. LACNIC WHOIS response results are limited by the number
of bytes, not records. The maximum size for a LACNIC WHOIS result
response is 65536 bytes. We will post APNIC's information upon receipt.
ARIN seeks input in order to determine the magnitude of the problem
caused by the current 256 results limit. For those impacted by the
limit, what alternative limit do you suggest and why?
American Registry for Internet Numbers (ARIN)
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