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I would like to clarify if indeed IP range and IP block can be seen as synonyms?

Or perhaps they have a specialized use case?

For example, is IP range used when the intention is to talk about a CIDR range, while IP block used when referring to a contiguous block of IP numbers, regardless of if they can (or cannot) be represented as a CIDR (ie valid subnet)?

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Definitions can be very context dependent, but I'd say they are the opposite of what you said. An IP block would (usually) refer to a group of addresses on a bit boundary (a CIDR block), while a range could be any group of contiguous addresses. These kind of definitions can be imprecise, so in many cases, they could be synonymous.

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  • In "spoken english", perhaps the person means the same thing. But you're technically correct (the best kind of correct!): 7-36 is a range, but it can't be written as a CIDR block.
    – Ricky
    Commented Nov 30, 2017 at 2:28
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    All blocks are ranges, but not all ranges are blocks
    – Ron Trunk
    Commented Nov 30, 2017 at 2:43

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