Phone prefixes in Cadillac, QC

In numbers

In-service prefixes

2

Telephone numbers covered

20,000

Carriers

2

Area codes

1

Provinces and territories

1

First assignment

March 28, 2013

Most recent assignment

March 28, 2013

Cadillac’s share of its area code

Within area code 819, Cadillac accounts for only 2 of 770 prefixes (0.3%): the code is dominated by Ottawa-Hull and spread over 211 rate centres.

Who holds these numbers

ISP Telecom Inc. holds the largest share at 1 prefixes, 50.0% of the total, ahead of 1 other carrier. Code by code: in 819, ISP Telecom Inc. leads with 1 of 2 prefixes ahead of 1 others.

Wireless and wireline

None of Cadillac’s holders carries a mobility brand in its registered name: all 2 prefixes belong to wireline or wholesale carriers, among them ISP Telecom Inc and Telebec Ltee. A call showing a Cadillac number therefore nominally comes from a landline, cable or VoIP platform rather than a locally assigned cellphone.

How the allocation was built up

Cadillac’s dated assignments run from 2013 to 2013. The busiest period was 2010–2014, when 1 prefixes went to 1 carrier. 1 prefixes (50%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. No prefix has been added since 2020: demand for numbers in Cadillac is flat.

Cadillac’s oldest prefixes, the ones the register leaves undated, belong to Telebec Ltee: this carrier made up the landscape before competition arrived. The first dated assignment went to ISP Telecom Inc. in 2013. The most recent arrivals are ISP Telecom Inc. (2013), a sign that new carriers are still asking for numbers in Cadillac.

Cadillac has just 2 prefixes (20,000 numbers): a very small rate centre, typical of a village or rural area served by a single switching office.

ISP Telecom Inc. leads with 50.0% of the prefixes, but 1 competitors have set up in Cadillac: a market where the incumbent keeps the edge without exclusivity.

Allocation is mature: only 0.0% of the dated prefixes are less than ten years old, most having been handed out in 2010–2014, and 1 prefixes go back to the undated monopoly era. New Cadillac numbers mostly come out of blocks that were assigned long ago.

Dialling a Cadillac number

A single area code, 819, covers Cadillac, and it is not overlaid with any other code on this territory: one of the few parts of Canada where seven-digit local dialling may still work. From abroad, dial +1 819 and the seven-digit number.

The numbering neighbourhood

Cadillac shares area code 819 with at least 20 other rate centres, including Ottawa-Hull, Sherbrooke, Trois-Rivieres, Drummondville, Val-D'Or, Gatineau, Shawinigan and Rouyn-Noranda. The largest of them, Ottawa-Hull, holds 83 prefixes in 819; the smallest on the list, Plessisville, has just 6.

What a Cadillac number tells you

A number attached to Cadillac tells you that its prefix was issued to a carrier for this rate centre in Quebec, most often ISP Telecom Inc.. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 2 carriers present here or to a VoIP service usable anywhere. Nor does it tell you who is calling: caller ID can be spoofed, and a Quebec area code is easy to borrow to look local.

Reading a register entry for Cadillac: code 819-945 is recorded for ISP Telecom Inc., so every 819-945-XXXX number (10,000 possible) descends from that assignment. “Cadillac, Quebec” there names a rate centre, not a municipality.

Every Cadillac prefix

Each row is an in-service central-office code recorded for Cadillac, with its original holder and year of assignment.

Allocated prefixes

All 2 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec