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IETF RFC 1860
Variable Length Subnet Table For IPv4 Last modified on Wednesday, October 18th, 1995 Permanent link to RFC 1860 Search GitHub Wiki for RFC 1860 Show other RFCs mentioning RFC 1860 Network Working Group T. Pummill Request for Comments: 1860 Alantec Category: Informational B. Manning ISI October 1995 Variable Length Subnet Table For IPv4 Status of this Memo This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract This document itemizes the potential values for IPv4 subnets. Additional information is provided for Hex and Decmial values, classfull equivalents, and number of addresses available within the indicated block. We appreciate inputs from Bruce Pinsky (cisco) and Daniel Karrenberg (RIPE). Table The following table lists the variable length subnets from 1 to 32, the CIDR representation form and the Decmial equivalents. Mask value: Hex CIDR Decimal #of add Classfull 80.00.00.00 /1 128.0.0.0 2048 M 128 A C0.00.00.00 /2 192.0.0.0 1024 M 64 A E0.00.00.00 /3 224.0.0.0 512 M 32 A F0.00.00.00 /4 240.0.0.0 256 M 16 A F8.00.00.00 /5 248.0.0.0 128 M 8 A FC.00.00.00 /6 252.0.0.0 64 M 4 A FE.00.00.00 /7 254.0.0.0 32 M 2 A FF.00.00.00 /8 255.0.0.0 16 M 1 A FF.80.00.00 /9 255.128.0.0 8 M 128 B FF.C0.00.00 /10 255.192.0.0 4 M 64 B FF.E0.00.00 /11 255.224.0.0 2 M 32 B FF.F0.00.00 /12 255.240.0.0 1024 K 16 B FF.F8.00.00 /13 255.248.0.0 512 K 8 B FF.FC.00.00 /14 255.252.0.0 256 K 4 B FF.FE.00.00 /15 255.254.0.0 128 K 2 B FF.FF.00.00 /16 255.255.0.0 64 K 1 B FF.FF.80.00 /17 255.255.128.0 32 K 128 C FF.FF.C0.00 /18 255.255.192.0 16 K 64 C Pummill & Manning Informational PAGE 1 |