[comp.protocols.iso] X.25/X.121 address registration

bobw@gapos.bt.co.uk (Bob Whitehouse) (06/26/91)

Question:  Who is responsible for the allocation of X.121
           address name space;

		1) In general ?

		2) In the UK and France ?

I am thinking in particular about public X.25 networks, and
how they integrate with private networks. This must be a common
problem for multi-national companies who have private X.25
networks in various countries and want to use an international service
(e.g. Tymnet) to bridge them. 


Is this just a free-for-all situation ? or are the public
network operators regulated ? 

I will summarise the answers and post to the group.


bobw@gapos.bt.co.uk

eskovgaa@CUE.BC.CA (Erik Skovgaard) (06/28/91)

Clearly, the CCITT is responsible for the allocation of the Data Country
Code (DCC) and in some cases also the Data Network Identification Code
(DNIC).

The DCC is the first 3 digits of the 4-digit DNIC.  Each contry's
Administration ((i.e. voting CCITT member) is then responsible for
the assignment of the last digit.  In some cases a country has more
than 10 data networks, so the Administration has to go to the CCITT for
additional DCC.

Some DNICs are allocated by the CCITT.  They are for instance, the maritime
packet networks (DNIC=1111 covers the Atlantic Ocean, 1112 the Pacific).

Hope that helps.
                                                    ....Erik.