The Cross Registry Information Service Protocol, or CRISP, is a computer network communications protocol which has been in development by a working group at the Internet Engineering Task Force since 2004. It is meant partially as a successor to the WHOIS protocol, extending it to a notion of "labels" instead of only working on domain names and IP addresses.
CRISP can be used to look up authoritative information about a label, such as which organisation owns a given IP block. It defines mechanisms for routing queries and replies to the appropriate CRISP servers, and query types are extensible through the use of XML to encode all transported data.
The iris.arpa second-level domain name is reserved for CRISP.
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