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X.25 User-Facility Support and Code References
page 68
Networks and DNICs
CCITT Recommendation X.121 defines a general address format containing 12, 13, or 14
digits. The first four digits of a general address format constitute the Data Network
Identification Code (DNIC). The first three digits of the DNIC generally identify the country—
much like telephone area codes—with the exception of large countries such as the United
States. The fourth digit identifies a particular network within the country.
The following table shows the DNICs of various public data networks around the world and
information/test numbers, as applicable. You can call these numbers for further information
about a given network, or to test your X.3 PAD parameter settings. The numbers in this table
are in effect at the time of publication.
Country Network DNIC Information/Test Number
Argentina ARPAC 7220
Austria Radio Austria 2320
Austria RADAUS 2329
Austria Datex-P 2322
Bahamas Batelco 3640
Barbados IDAS 3420
Belgium DCS 2062
Bermuda IPSD 3500
Brazil Interdata 7240
Canada (Telecom) Datapac 3020 76000002
Include “ECHO” in Call User Data field of
call request or connect command.
Canada (CN/CP) Infoswitch 3029
Chile ENTEL 7302
Colombia DAPAQ 3107
Denmark Datapak 2382
Dominican
Republic
UDTS 3700
Egypt Arento 6020
Finland Finnpak 2442
France Transpac 2080 0030100
France NTI 2081
Germany Datex-P 2624 5690049002
Include “ECHO” in Call User Data field of
call request or connect command.
Greece Helpak 2022
Guatemala Guatel 7040
Hong Kong IDAS 4542
Iceland Icepak 2740
Indonesia SKDP 5101
Ireland EIRPAC 2724
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