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Home/ Questions/Q 8324639
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Editorial Team
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Editorial Team
Asked: June 9, 20262026-06-09T00:08:50+00:00 2026-06-09T00:08:50+00:00

Do scope Id’s and network masks represent the same thing? Also, are masked addresses

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Do scope Id’s and network masks represent the same thing?
Also, are masked addresses equivalent to addresses with their scope id’s. The reason I ask is because I often seen network masks indicated after a “/” after an address; scope id’s are often represented as following a “%” after an address.

The reason I need to know is because I want to use RtlIpv6StringToAddressEx to convert a masked address to its binary form, but it states it takes a scope id as input, not a network mask.

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  1. Editorial Team
    Editorial Team
    2026-06-09T00:08:52+00:00Added an answer on June 9, 2026 at 12:08 am

    They are conceptually different thing, but are often isomorph.

    Network masks identify how many addresses belongs to a same routing rule.
    Scope ids identify a group of addresses taken from a same pool.

    But

    • because many IP subnets are organized onto Ethernet “broadcast domain” (the hots that see a same broadcast frame) and …
    • because the DHPC discovery packet send by an host with no IP address (yet) is a broadcast frame that is realyed by a router and …
    • because that router signs that packet with its own address before relaying it, to let the DHCP server to keep an address that can be sent-back and …
    • because that address to work, must be routable by that same router …

    we come to the consequence that network SUBNETS (not masks!: an address/mask pair) and scopes must at most coincide. (in fact a scope can be smaller than a subnet).

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