Internet Query Tools

Subnet Calculators

  • IPv4 Calculator( – An IPv4 Subnet Calculator to help you calculate the number of hosts, start IP and end IP of your range, network and broadcast
  • IPv6 Calculator( – An IPv6 Subnet Calculator for mapping and creating multiple hierarchical subnets (converting multiple subnet networks from IPv4 to IPv6).

IPv4 Depletion Dates (

  • Asia/Pacific (APNIC): 2011-05-07
  • Europe and Middle East (RIPE):  2012-06-13
  • North America (ARIN): 2013-05-16
  • Africa (AfriNIC): 2015-03-02
  • South America (LACNIC): 2016-03-19

Other Useful Information

  • BGP Routing Table Analysis( – Shows growth of the Internet (BGP) routing table from 1994 to present
  • The Future of IP Addressing– Keynote presentation at SANOG by Joe Abley
  • Understanding IP Addressing– A paper on IPv4 Addressing written by Chuck Semeria – NSD Marketing, 3Com Corporation
  • IPv6, the Next Generation Network Playground- A presentation on IPv6 Addressing (Joe Klein)