<h1 align="center"> SubNetCalc An IPv4/IPv6 Subnet Calculator <a href="https://www.nntb.no/~dreibh/subnetcalc/"> https://www.nntb.no/~dreibh/subnetcalc </a> </h1>

💡 What is SubNetCalc?

SubNetCalc is an IPv4/IPv6 subnet address calculator. For given IPv4 or IPv6 address and netmask or prefix length, it calculates network address, broadcast address, maximum number of hosts and host address range. Also, it prints the addresses in binary format for better understandability. Furthermore, it prints useful information on specific address types (e.g. type, scope, interface ID, etc.).

😀 Examples

My host has IP 132.252.150.154 and netmask 255.255.255.240. What are the details of its network?
<pre><code>user@host:~$ subnetcalc 132.252.150.154 255.255.255.240 Address = 132.252.150.154 10000100 . 11111100 . 10010110 . 10011010 Network = 132.252.150.144 / 28 Netmask = 255.255.255.240 Broadcast = 132.252.150.159 Wildcard Mask = 0.0.0.15 Hex. Address = 84FC969A Hosts Bits = 4 Max. Hosts = 14 (2^4 - 2) Host Range = { 132.252.150.145 - 132.252.150.158 } Properties = - 132.252.150.154 is a HOST address in 132.252.150.144/28 - Class B GeoIP Country = Germany (DE) DNS Hostname = lupo.iem.uni-due.de </code></pre>
Consider host www.heise.de uses a 64-bit prefix length. What are the details of its network?
<pre><code>user@host:~$ subnetcalc www.heise.de 64 Address = 2a02:2e0:3fe:1001:7777:772e:2:85 2a02 = 00101010 00000010 02e0 = 00000010 11100000 03fe = 00000011 11111110 1001 = 00010000 00000001 7777 = 01110111 01110111 772e = 01110111 00101110 0002 = 00000000 00000010 0085 = 00000000 10000101 Network = 2a02:2e0:3fe:1001:: / 64 Netmask = ffff:ffff:ffff:ffff:: Wildcard Mask = ::ffff:ffff:ffff:ffff Hosts Bits = 64 Max. Hosts = 18446744073709551615 (2^64 - 1) Host Range = { 2a02:2e0:3fe:1001::1 - 2a02:2e0:3fe:1001:ffff:ffff:ffff:ffff } Properties = - 2a02:2e0:3fe:1001:7777:772e:2:85 is a HOST address in 2a02:2e0:3fe:1001::/64 - Global Unicast Properties: + Interface ID = 7777:772e:0002:0085 + Solicited Node Multicast Address = ff02::1:ff02:0085 + 6-to-4 Address = 2.224.3.254 GeoIP Country = Germany (DE) DNS Hostname = www.heise.de </code></pre>
My new host should use Interface ID 0x100 and Subnet ID 0x1234. Generate a Unique Local IPv6 prefix (40-bit Global ID) for my intranet, according to RFC 4193, using high quality random numbers!
<pre><code>user@host:~$ subnetcalc 0:0:0:1234::100 64 -uniquelocalhq Generating Unique Local IPv6 address (using /dev/random) ... Address = fd22:6892:1a2d:1234::100 fd22 = 11111101 00100010 6892 = 01101000 10010010 1a2d = 00011010 00101101 1234 = 00010010 00110100 0000 = 00000000 00000000 0000 = 00000000 00000000 0000 = 00000000 00000000 0100 = 00000001 00000000 Network = fd22:6892:1a2d:1234:: / 64 Netmask = ffff:ffff:ffff:ffff:: Wildcard Mask = ::ffff:ffff:ffff:ffff Hosts Bits = 64 Max. Hosts = 18446744073709551615 (2^64 - 1) Host Range = { fd22:6892:1a2d:1234::1 - fd22:6892:1a2d:1234:ffff:ffff:ffff:ffff } Properties = - fd22:6892:1a2d:1234::100 is a HOST address in fd22:6892:1a2d:1234::/64 - Unique Local Unicast Properties: + Locally chosen + Global ID = 2268921a2d + Subnet ID = 1234 + Interface ID = 0000:0000:0000:0100 + Solicited Node Multicast Address = ff02::1:ff00:0100 GeoIP Country = Unknown (??) DNS Hostname = (Name or service not known) </code></pre>
Which are DNS reverse lookup name and geo-location country of IP 2401:3800:c001::68?
<pre><code>user@host:~$ subnetcalc 2401:3800:c001::68 Address = 2401:3800:c001::68 2401 = 00100100 00000001 3800 = 00111000 00000000 c001 = 11000000 00000001 0000 = 00000000 00000000 0000 = 00000000 00000000 0000 = 00000000 00000000 0000 = 00000000 00000000 0068 = 00000000 01101000 Network = 2401:3800:c001::68 / 128 Netmask = ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff Wildcard Mask = :: Hosts Bits = 0 Max. Hosts = 0 (2^0 - 1) Host Range = { 2401:3800:c001::69 - 2401:3800:c001::68 } Properties = - 2401:3800:c001::68 is a NETWORK address - Global Unicast Properties: + Interface ID = 0000:0000:0000:0068 + Solicited Node Multicast Address = ff02::1:ff00:0068 GeoIP Country = China (CN) DNS Hostname = bg-in-x68.1e100.net </code></pre>
Which are the MAC address and Solicited Node Multicast address of 2001:638:501:4ef8:223:aeff:fea4:8ca9/64?
<pre><code>user@host:~$ subnetcalc 2001:638:501:4ef8:223:aeff:fea4:8ca9/64 Address = 2001:638:501:4ef8:223:aeff:fea4:8ca9 2001 = 00100000 00000001 0638 = 00000110 00111000 0501 = 00000101 00000001 4ef8 = 01001110 11111000 0223 = 00000010 00100011 aeff = 10101110 11111111 fea4 = 11111110 10100100 8ca9 = 10001100 10101001 Network = 2001:638:501:4ef8:: / 64 Netmask = ffff:ffff:ffff:ffff:: Wildcard Mask = ::ffff:ffff:ffff:ffff Hosts Bits = 64 Max. Hosts = 18446744073709551615 (2^64 - 1) Host Range = { 2001:638:501:4ef8::1 - 2001:638:501:4ef8:ffff:ffff:ffff:ffff } Properties = - 2001:638:501:4ef8:223:aeff:fea4:8ca9 is a HOST address in 2001:638:501:4ef8::/64 - Global Unicast Properties: + Interface ID = 0223:aeff:fea4:8ca9 + MAC Address = 00:23:ae:a4:8c:a9 + Solicited Node Multicast Address = ff02::1:ffa4:8ca9 GeoIP Country = Germany (DE) DNS Hostname = (Name or service not known) </code></pre>
Take a look into the manual page of SubNetCalc for further information and options:
```
man subnetcalc
```

📦 Binary Package Installation

Please use the issue tracker at https://github.com/dreibh/subnetcalc/issues to report bugs and issues!

Ubuntu Linux

For ready-to-install Ubuntu Linux packages of SubNetCalc, see Launchpad PPA for Thomas Dreibholz!

sudo apt-add-repository -sy ppa:dreibh/ppa
sudo apt-get update
sudo apt-get install subnetcalc

Fedora Linux

For ready-to-install Fedora Linux packages of SubNetCalc, see COPR PPA for Thomas Dreibholz!

sudo dnf copr enable -y dreibh/ppa
sudo dnf install subnetcalc

FreeBSD

For ready-to-install FreeBSD packages of SubNetCalc, it is included in the ports collection, see FreeBSD ports tree index of net/subnetcalc/!

Subnetcalc

Install / Use

README