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  • [IP-Doc.com] RFC 950 - Internet Standard Subnetting Procedure
  • [IP-Doc.com] RFC 1519 - Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy
  • [IP-Doc.com] RFC 1860 - Variable Length Subnet Table For IPv4
  • [IP-Doc.com] RFC 3021 - Using 31-Bit Prefixes on IPv4 Point-to-Point Links
  • JP's Domain - Net Tools
  • Excellent DNS Propogation Checker
  • png2ico.com Fully featured PNG, JPG & GIF to ICO converter
  • ASCII Table
  • e-Planet
  • IP Calc - CIDR Calculator optimized for Mobile devices