Data Network Identification Codes
Most X.25 based public data networks around the world are interconnected using the CCITT X.75 protocol. An addressing scheme for global data networks is the X.121 standard. Under this standard, a host address consists of 14-digits:
The above example address is the same as 914123.01 on Telenet.
The NUA is the Network User Address of the host machine on that network.
The DNIC for Telenet is 3110.
The PORT is optional and can be excluded because most host machines will "hunt" from port to port.
A Data Network Identification Code (DNIC) is a 4-digit code that is used to identify the network which will connect you to a host machine. A DNIC is used as a prefix before the Network User Address (NUA). The first digit of the DNIC is one of 7 designated world zones.
Using DNICs is fairly simple. For example, if I was connected to Telenet and wanted to reach a host on the Austrian DATEX-P network I would use:
The NUI and PASSWORD are optional if the host machine is willing to accept collect calls.
Your NUI and PASSWORD is your account that you have set up with Telenet. It is very similar to a PC Pursuit account. In fact, if you have a PCP account, you can use that to connect to foreign hosts.
The following is a list of DNICs along with their countries and networks:
Here is the same list in DNIC order, to help give you a sense of how the codes are allocated: