633 Area Code
Canadian non-geographic services for Internet of Things and M2M
The 633 area code is reserved for Canadian non-geographic services — specifically Internet of Things and machine-to-machine devices.
How 633 is used
Numbers in 633 are issued by the CNA to Canadian providers for IoT and machine-to-machine devices such as connected sensors, telematics units, smart meters and other unattended endpoints. The code is dialed as a full ten-digit number (1-633-NXX-XXXX), though most numbers in it never carry human voice traffic. 633 sits alongside 600 and 622 in Canada's non-geographic numbering pool.
- Purpose
- Canadian non-geographic services for Internet of Things and M2M
- Assignee
- Canadian Numbering Administrator (CNA) under CRTC guidelines
- Dialed as
- 1-633-NXX-XXXX
History
Creation: Area code 633 was assigned to Canada on April 10, 2023 and placed into service on May 15, 2023 as the second 6YY non-geographic NPA, relieving 622. It was activated specifically to absorb the high assignment rate of telephone numbers used for IoT/M2M applications. It is part of the same 6YY relief block (622, 633, 644, 655, 677, 688) that NANPA reserved for Canadian non-geographic expansion.
Relieved: Area code 633 was activated to relieve 622.
Mnemonics: The digits 633 map to letter combinations on the standard telephone keypad, yielding 27 possible three-letter mnemonics. Prior to 1995, the middle digit of area codes was restricted to 0 or 1 — codes created before then cannot form mnemonics.
Other special-use area codes
Same-category codes first, then the rest of the NANP special-use portfolio.
Frequently Asked Questions
What is area code 633 used for?
633 is a special-use area code in the North American Numbering Plan. The 633 area code is reserved for Canadian non-geographic services — specifically Internet of Things and machine-to-machine devices.
How is 633 dialed?
Numbers in 633 are dialed as a full ten-digit number (1-633-NXX-XXXX). It is a non-geographic area code, so 1-633 numbers are not tied to any city or state.
Who assigns 633 numbers?
Canadian Numbering Administrator (CNA) under CRTC guidelines
What did 633 relieve or replace?
Area code 633 was activated to relieve 622 as that pool of numbers neared exhaustion.
When did area code 633 go into service?
Area code 633 was placed into service on May 15, 2023. It was the 2nd area code used for Canadian 6YY non-geographic services.