Signal & Syntax · Numbers and formats
What Is a Numbering Range?
A numbering range is a block of consecutive numbers allocated to one operator. The range prefix names the operator that received the block.A numbering range is a block of consecutive numbers allocated to one operator. The range prefix names the operator that received the block.A numbering range is a block of consecutive numbers allocated to one operator. The range prefix names the operator that received the block.
Also callednumber block · number range
Example
+44 7911 1xx xxx → one block, one range holder
Numbering Range in Practice
Routing tables once relied on the range alone. A prefix pointed to one operator, and traffic went there. Routing tables once relied on the range alone. A prefix pointed to one operator, and traffic went there. Routing tables once relied on the range alone. A prefix pointed to one operator, and traffic went there. Mobile number portabilityMobile number portability broke the range-to-operator link, because a broke the range-to-operator link, because a broke the range-to-operator link, because a ported numberported number moves networks. The range still sets the number's country, moves networks. The range still sets the number's country, moves networks. The range still sets the number's country, line typeline type and original operator. and original operator. and original operator.
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Read the Guide
Guide
Mobile Number Portability and SMS Routing
Why the range holder is the wrong carrier for a ported number. Read the guide →Run the Checks on Your Own List
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