Subnet Calculator

Not really a calculator, but more so a table containing all the subnets and how many usable addresses (Subnet Size – 2 for the network and broadcast address)

        Subnets Usable Addresses
Subnet Mask Class A Class B Class C Class A Class B Class C
Class A /8 255.0.0.0 1     16777214    
/9 255.128.0.0 2     8388606    
/10 255.192.0.0 4     4194302    
/11 255.224.0.0 8     2097150    
/12 255.240.0.0 16     1048574    
/13 255.248.0.0 32     524286    
/14 255.252.0.0 64     262142    
/15 255.254.0.0 128     131070    
Class B   /16 255.255.0.0 256 1   65534 65534  
/17 255.255.128.0 512 2   32766 32766  
/18 255.255.192.0 1024 4   16382 16382  
/19 255.255.224.0 2048 8   8190 8190  
/20 255.255.240.0 4096 16   4094 4094  
/21 255.255.248.0 8192 32   2046 2046  
/22 255.255.252.0 16384 64   1022 1022  
/23 255.255.254.0 32768 128   510 510  
Class C     /24 255.255.255.0 65536 256 1 254 254 254
/25 255.255.255.128 131072 512 2 126 126 126
/26 255.255.255.192 262144 1024 4 62 62 62
/27 255.255.255.224 524288 2048 8 30 30 30
/28 255.255.255.240 1048576 4096 16 14 14 14
/29 255.255.255.248 2097152 8192 32 6 6 6
/30 255.255.255.252 4194304 16384 64 2 2 2

Special Use IPv4 Addresses

Address blockAddress rangeNumber of addressesScopeDescription
0.0.0.0/80.0.0.0–0.255.255.25516777216SoftwareCurrent network[3] (only valid as source address).
10.0.0.0/810.0.0.0–10.255.255.25516777216Private networkUsed for local communications within a private network.[4]
100.64.0.0/10100.64.0.0–100.127.255.2554194304Private networkShared address space[5] for communications between a service provider and its subscribers when using a carrier-grade NAT.
127.0.0.0/8127.0.0.0–127.255.255.25516777216HostUsed for loopback addresses to the local host.[3]
169.254.0.0/16169.254.0.0–169.254.255.25565536SubnetUsed for link-local addresses[6] between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server.
172.16.0.0/12172.16.0.0–172.31.255.2551048576Private networkUsed for local communications within a private network.[4]
192.0.0.0/24192.0.0.0–192.0.0.255256Private networkIETF Protocol Assignments.[3]
192.0.2.0/24192.0.2.0–192.0.2.255256DocumentationAssigned as TEST-NET-1, documentation and examples.[7]
192.88.99.0/24192.88.99.0–192.88.99.255256InternetReserved.[8] Formerly used for IPv6 to IPv4 relay[9] (included IPv6 address block 2002::/16).
192.168.0.0/16192.168.0.0–192.168.255.25565536Private networkUsed for local communications within a private network.[4]
198.18.0.0/15198.18.0.0–198.19.255.255131072Private networkUsed for benchmark testing of inter-network communications between two separate subnets.[10]
198.51.100.0/24198.51.100.0–198.51.100.255256DocumentationAssigned as TEST-NET-2, documentation and examples.[7]
203.0.113.0/24203.0.113.0–203.0.113.255256DocumentationAssigned as TEST-NET-3, documentation and examples.[7]
224.0.0.0/4224.0.0.0–239.255.255.255268435456InternetIn use for IP multicast.[11] (Former Class D network).
240.0.0.0/4240.0.0.0–255.255.255.254268435456InternetReserved for future use.[12] (Former Class E network).
255.255.255.255/32255.255.255.2551SubnetReserved for the “limited broadcast” destination address.[3][13]

https://en.wikipedia.org/wiki/IPv4#Special-use_addresses

Special Use IPv6 Addresses

Address block (CIDR)First addressLast addressNumber of addressesUsagePurpose
::/0::ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff2128RoutingDefault route.
::/128:: 1SoftwareUnspecified address.
::1/128::1 1HostLoopback address to the local host.
::ffff:0:0/96::ffff:0.0.0.0::ffff:255.255.255.2552128−96 = 2324294967296SoftwareIPv4 mapped addresses.
::ffff:0:0:0/96::ffff:0:0.0.0.0::ffff:0:255.255.255.255232SoftwareIPv4 translated addresses.
64:ff9b::/9664:ff9b::0.0.0.064:ff9b::255.255.255.255232Global InternetIPv4/IPv6 translation.[26]
100::/64100::100::ffff:ffff:ffff:ffff264RoutingDiscard prefix.[27]
2001::/322001::2001::ffff:ffff:ffff:ffff:ffff:ffff296Global InternetTeredo tunneling.
2001:20::/282001:20::2001:2f:ffff:ffff:ffff:ffff:ffff:ffff2100SoftwareORCHIDv2.[28]
2001:db8::/322001:db8::2001:db8:ffff:ffff:ffff:ffff:ffff:ffff296DocumentationAddresses used in documentation and example source code.[29]
2002::/162002::2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff2112Global InternetThe 6to4 addressing scheme (now deprecated).[30]
fc00::/7fc00::fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff2121Private networkUnique local address.[31]
fe80::/10fe80::febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff2118LinkLink-local address.
ff00::/8ff00::ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff2120Global InternetMulticast address.

https://en.wikipedia.org/wiki/IPv6_address#Special_addresses

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