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How do Network Licenses Work?
A Network License requires that the host PC has a network IP address from a
specified range of addresses. Network licenses are ideal for the following
cases:
- Universities (50% Educational discount applies), and
- Corporations
IP networks are the most common type of network used worldwide; if your PC is
connected to the Internet, chances are it has an IP address. IP Networks are
expressed in terms of a network address, and a Subnet mask. The
common network types are:
| Network
Type |
Example
Network Address |
Subnet
Mask |
Usable
Addresses |
| Class A |
125.0.0.0 |
255.0.0.0 |
16,000,000+ |
| Class B |
130.54.0.0 |
255.555.0.0 |
65,000+ |
| Class C |
194.31.26.0 |
255.255.255.0 |
254 |
| Custom |
194.31.26.128 |
255.255.255.192 |
62 |
Example
- The University of Technology wants to teach a course using an Erlang-Software
product. The Computer Science Dept uses a number of IP networks, but only needs
to run the software on PCs connected to one Class C network;
163.186.34.0.
- The university purchases a Class C license, and receives a license key.
- The standard copy of the software (as downloaded
from this site) is installed on the PCs in question. The license key is made
freely available to the students. The first time the software is run on a
given PC, the license key is entered by one of the students.
- The students and lecturers use the software as normal.
- One student takes home a copy of the software, and the license key. He
installs the software on his home PC, and enters the license key. The
software fails to run, as the home PC is NOT part of the 163.186.34.0
network.
Frequently asked Questions
- How do I find my IP Network Address?
The easiest is to ask you network administrator. Alternatively,
- Win9x:Start->Run->winipcfg and note the IP address and
Subnet Mask.
- WinNT/2000: Start->Programs->Command Prompt. In the
MS-DOS window, type: ipconfig /all. Press <enter>, and you will
see the network details.
- Will the license key work with multi-homed PCs -
i.e. PCs with more than one IP address?
Yes. The license is checked against ALL IP addresses active on that PC.
- Are Network Licenses compatible with DHCP?
Yes. Dynamic Host Configuration Protocol (DHCP) is just a mechanism to
assign IP addresses to computers. The Network License checks the assigned IP
address is in the allowed range.
- Can I get a Network License for a Private
Networks?
No. Private Networks are defined by the planners of the Internet, as
networks comprised of IP addresses from specified ranges. These IP addresses
are not permitted on the Internet. They are often used behind Network
Address Translation (NAT) firewalls/devices. Network Licenses will NOT be
issued for Private Networks as these networks are NOT unique to one organization.
The Private Networks are defined to be:
- 10.0.0.0 ... 10.255.255.255 (Subnet mask = 255.0.0.0)
- 172.16.0.0 ... 172.31.255.255 (Subnet mask = 255.240.0.0)
- 192.168.0.0 ... 192.168.255.255 (Subnet mask 255.255.0.0)
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