University of Duisburg-Essen / Institute for Experimental Mathematics / Computer Networking Technology Group / Thomas Dreibholz
03-May-2011: Released version 2.1.3. Fixed compile problem under Debian Wheezy and Ubuntu Oneiric.
27-Jul-2010: Released version 2.1.2. Improved autoconf/automake scripts for FreeBSD.
30-Jun-2010: Released version 2.1.1.
19-Jun-2010: Released version 2.1.0. This new version includes support for GeoIP and IDN
20-Jun-2009: Released version 2.0.4.
06-Jun-2009: Released version 2.0.2. It fixes a problem with IPv6 Unique Local address generation under non-Linux systems.
03-Jun-2009: Released version 2.0.1!
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.).
My host has IP 132.252.150.254 and netmask 255.255.255.240. What are the details of its network?
user@host:~$ subnetcalc 132.252.150.254 255.255.255.240
Address = 132.252.150.254
10000100 . 11111100 . 10010110 . 11111110
Network = 132.252.150.240 / 28
Netmask = 255.255.255.240
Broadcast = 132.252.150.255
Wildcard Mask = 0.0.0.15
Hosts Bits = 4
Max. Hosts = 14 (2^4 - 2)
Host Range = { 132.252.150.241 - 132.252.150.254 }
Properties =
- 132.252.150.254 is a HOST address in 132.252.150.240/28
- Class B
GeoIP Country = Germany (DE)
DNS Hostname = dummy.iem.uni-duisburg-essen.de
Consider host www.six.heise.de uses a 64-bit prefix length. What are the details of its network?
user@host:~$ subnetcalc www.six.heise.de 64
Address = 2a02:2e0:3fe:100::6
2a02 = 00101010 00000010
02e0 = 00000010 11100000
03fe = 00000011 11111110
0100 = 00000001 00000000
0000 = 00000000 00000000
0000 = 00000000 00000000
0000 = 00000000 00000000
0006 = 00000000 00000110
Network = 2a02:2e0:3fe:100:: / 64
Netmask = ffff:ffff:ffff:ffff::
Wildcard Mask = ::ffff:ffff:ffff:ffff
Hosts Bits = 64
Max. Hosts = 18446744073709551616 (2^64 - 1)
Host Range = { 2a02:2e0:3fe:100::1 - 2a02:2e0:3fe:100:ffff:ffff:ffff:ffff }
Properties =
- 2a02:2e0:3fe:100::6 is a HOST address in 2a02:2e0:3fe:100::/64
- Global Unicast Properties:
+ Interface ID = 0000:0000:0000:0006
+ Sol. Node MC = ff02::1:ff00:0006
GeoIP Country = Germany (DE)
DNS Hostname = www.six.heise.de
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, using high-quality random numbers!
user@host:~$ subnetcalc 0:0:0:1234::1 56 -uniquelocalhq
Address = fded:30d0:1072:1234::1
fded = 11111101 11101101
30d0 = 00110000 11010000
1072 = 00010000 01110010
1234 = 00010010 00110100
0000 = 00000000 00000000
0000 = 00000000 00000000
0000 = 00000000 00000000
0001 = 00000000 00000001
Network = fded:30d0:1072:1200:: / 56
Netmask = ffff:ffff:ffff:ff00::
Wildcard Mask = ::ff:ffff:ffff:ffff:ffff
Hosts Bits = 72
Max. Hosts = 4722366482869645213696 (2^72 - 1)
Host Range = { fded:30d0:1072:1200::1 - fded:30d0:1072:12ff:ffff:ffff:ffff:ffff }
Properties =
- fded:30d0:1072:1234::1 is a HOST address in fded:30d0:1072:1200::/56
- Unique Local Unicast Properties:
+ Locally chosen
+ Global ID = ed30d01072
+ Subnet ID = 1234
+ Interface ID = 0000:0000:0000:0001
+ Sol. Node MC = ff02::1:ff00:0001
GeoIP Country = Unknown (??)
DNS Hostname = (Name or service not known)
Which are DNS reverse lookup name and geo location country of IP 2401:3800:c001::68?
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
+ Sol. Node MC = ff02::1:ff00:0068
GeoIP Country = China (CN)
DNS Hostname = bg-in-x68.1e100.net
Which are the MAC address and Solicited Node Multicast address of 2001:638:501:4ef8:223:aeff:fea4:8ca9/64?
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 = 18446744073709551616 (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
+ Sol. Node MC = ff02::1:ffa4:8ca9
GeoIP Country = Germany (DE)
DNS Hostname = (Name or service not known)
For ready-to-install Ubuntu packages, see PPA for Thomas Dreibholz!
03.05.2011 Thomas Dreibholz, University of Duisburg-Essen / Institute for Experimental Mathematics / Computer Networking Technology Group
