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Internet Protocol (IPv4) Subnet Chart









Internet Protocol (IPv4) Subnet Chart

Posted on 08-16-2003 06:23:00 UTC | Updated on 08-16-2003 06:23:00 UTC
Section: /software/tcpip/ |
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Ths is an Internet Protocol (IPv4) Subnet Chart. You can use this to quickly look up how your might need to subnet your network. At the bottom there is a quick how-to on calculating subnets. For more information on subnetting, see RFC 1817 and RFC 1812. Class address ranges: Class A = 1.0.0.0 to 126.0.0.0 Class B = 128.0.0.0 to 191.255.0.0 Class C = 192.0.1.0 to 223.255.255.0 Reserved address ranges for private (non-routed) use (see RFC 1918): 10.0.0.0 -> 10.255.255.255 172.16.0.0 -> 172.31.255.255 192.168.0.0 -> 192.168.255.255 Other reserved addresses: 127.0.0.0 is reserved for loopback and IPC on the local host 224.0.0.0 -> 239.255.255.255 is reserved for multicast addresses Chart notes: Number of Subnets - "( )" Refers to the number of effective subnets, since the use of subnet numbers of all 0s or all 1s is highly frowned upon and RFC non-compliant. Number of Hosts - Refers to the number of effective hosts, excluding the network and broadcast address. Class A Network Bits Subnet Mask Number of Subnets Number of Hosts /8 255.0.0.0 0 16777214 /9 255.128.0.0 2 (0) 8388606 /10 255.192.0.0 4 (2) 4194302 /11 255.224.0.0 8 (6) 2097150 /12 255.240.0.0 16 (14) 1048574 /13 255.248.0.0 32 (30) 524286 /14 255.252.0.0 64 (62) 262142 /15 255.254.0.0 128 (126) 131070 /16 255.255.0.0 256 (254) 65534 /17 255.255.128.0 512 (510) 32766 /18 255.255.192.0 1024 (1022) 16382 /19 255.255.224.0 2048 (2046) 8190 /20 255.255.240.0 4096 (4094) 4094 /21 255.255.248.0 8192 (8190) 2046 /22 255.255.252.0 16384 (16382) 1022 /23 255.255.254.0 32768 (32766) 510 /24 255.255.255.0 65536 (65534) 254 /25 255.255.255.128 131072 (131070) 126 /26 255.255.255.192 262144 (262142) 62 /27 255.255.255.224 524288 (524286) 30 /28 255.255.255.240 1048576 (1048574) 14 /29 255.255.255.248 2097152 (2097150) 6 /30 255.255.255.252 4194304 (4194302) 2 Class B Network Bits Subnet Mask Number of Subnets Number of Hosts /16 255.255.0.0 0 65534 /17 255.255.128.0 2 (0) 32766 /18 255.255.192.0 4 (2) 16382 /19 255.255.224.0 8 (6) 8190 /20 255.255.240.0 16 (14) 4094 /21 255.255.248.0 32 (30) 2046 /22 255.255.252.0 64 (62) 1022 /23 255.255.254.0 128 (126) 510 /24 255.255.255.0 256 (254) 254 /25 255.255.255.128 512 (510) 126 /26 255.255.255.192 1024 (1022) 62 /27 255.255.255.224 2048 (2046) 30 /28 255.255.255.240 4096 (4094) 14 /29 255.255.255.248 8192 (8190) 6 /30 255.255.255.252 16384 (16382) 2 Class C Network Bits Subnet Mask Number of Subnets Number of Hosts /24 255.255.255.0 0 254 /25 255.255.255.128 2 (0) 126 /26 255.255.255.192 4 (2) 62 /27 255.255.255.224 8 (6) 30 /28 255.255.255.240 16 (14) 14 /29 255.255.255.248 32 (30) 6 /30 255.255.255.252 64 (62) 2 Supernetting (CIDR) Chart CIDR - Classless Inter-Domain Routing. Note: The Number of Class C networks must be contiguous. For example, 192.169.1.0/22 represents the following block of addresses: 192.169.1.0, 192.169.2.0, 192.169.3.0 and 192.169.4.0. Class C CIDR Block Supernet Mask Number of Class C Addresses Number of Hosts /14 255.252.0.0 1024 262144 /15 255.254.0.0 512 131072 /16 255.255.0.0 256 65536 /17 255.255.128.0 128 32768 /18 255.255.192.0 64 16384 /19 255.255.224.0 32 8192 /20 255.255.240.0 16 4096 /21 255.255.248.0 8 2048 /22 255.255.252.0 4 1024 /23 255.255.254.0 2 512 Quick Subnetting How-To (Thanks to Jason@ GeekVenue.) [Understanding decimal - Base 10] The first thing you must know is that the common number system used world wide is the decimal system (otherwise known as base 10). What makes the decimal system a base 10 system is that it is based on grouping numbers by 10's. It is believed that the system evolved because we have ten fingers and ten toes which over the years we have used for counting. I use mine all the time (grin). We name the ten digits: zero, one, two, three, four, five, six, seven, eight and nine. The decimal system has a 1's place, a 10's place, a 100's place, a 1000's place and so on. We say the number places are grouped by 10's because multiplying each number place by 10 gives you the next number place. So: 1x10=10 (the 10's place), 10x10=100 (the 100's place), 100x10=1000 (the 1000's place) etc. Let's look at the decimal number 103 by place. 103








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