The Prefix WhoIs Project

The Prefix WhoIs Project provides a whois-compatible client and server framework for disclosing various up-to-date routing information. Instead of using registrar-originated network information (which is often unspecific or inaccurate), Prefix WhoIs uses the Internet's global routing table as gleaned from a number of routing peers around the world. Other sources of information, such as imported data from ARIN are also supported (a separate agreement with ARIN is required).

You may visit the software pages to get copies of the source code, download the programs, or learn more about the project. A summary of what the project offers is below:

Public Prefix WhoIs Service

The Prefix WhoIs project operates a global network of servers running a derivative of our Prefix WhoIs Server software. 100% of our network resources (servers, network transit, etc.) have been donated by public or private organizations. Many of our servers are operated by large Internet Service Providers. Please visit our About Us pages for a larger list of our contributors.

Client Software

  • Prefix WhoIs Widget is a simple MacOS X widget that displays the number of prefixes present within the global Internet routing table and allows the user to submit queries using a familiar Dashboard interface.
  • Layer Four Traceroute (LFT) is an advanced path discovery tool whose ASN resolution features rely on Prefix WhoIs. LFT can be downloaded here.

Server Software

  • The pWhoIsd server responds to whois-type queries using a variety of output formats including pWhoIs-native, Cymru, and RPSL
  • The pWhoIs-updatedb agent parses routing information bases (RIBs) from Internet routers or digests from route-views servers and populates a relational database

Software Development Libraries

Currently, the Prefix WhoIs project distributes vanilla C and PHP libraries for direct access to Prefix WhoIs. Our C library is also used by many developers to access a plethora of other whois registries as it contains many functions to do so.

  • C Library for pWhoIs - Full support for pWhoIs in bulk or single queries. Additionally, this library supports many other network-related registrars along with functions to automatically recursively dig until you get the information you're looking for. The most recent copy of the whois library (whois.c & whois.h) may be found in the latest distribution of Layer Four Traceroute.
  • PHP Library for pWhoIs - Minimal support for pWhoIs (work in progress). Requires PHP 5.x (sockets related).
  • PHP Library for RIPE NCC RISwhois - Reasonable support for resolving prefix and other information from RIPE NCC's RIS (work in progress). Requires PHP 5.x (sockets related).

Currently Nov 26th 2020, 4:51am GMT