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From: eskovgaa@CUE.BC.CA (Erik Skovgaard)
Newsgroups: comp.protocols.iso
Subject: X.25/X.121 address registration
Message-ID: <490*eskovgaa@cue.bc.ca>
Date: 28 Jun 91 15:47:00 GMT
References: <bobw.677940807@azh01>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 15

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.