# Blacklist ip blocks - ip range?

**URL:** <https://meta.discourse.org/t/blacklist-ip-blocks-ip-range/175376>\
**Category:** Product Support\
**Created:** [January 7, 2021, 12:44pm UTC](https://meta.discourse.org/t/blacklist-ip-blocks-ip-range/175376 "2021-01-07T12:44:36Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Falco](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/falco/32/179432_2.png) [@Falco](https://meta.discourse.org/u/Falco)\
**Post date:** [January 20, 2021, 6:07pm UTC](https://meta.discourse.org/t/blacklist-ip-blocks-ip-range/175376/6 "2021-01-20T18:07:17Z")

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> **[Classless Inter-Domain Routing | CIDR blocks](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#CIDR_blocks)**
>
> CIDR is principally a bitwise, prefix-based standard for the representation of IP addresses and their routing properties. It facilitates routing by allowing blocks of addresses to be grouped into single routing table entries. These groups, commonly called CIDR blocks, share an initial sequence of bits in the binary representation of their IP addresses. IPv4 CIDR blocks are identified using a syntax similar to that of IPv4 addresses: a dotted-decimal address, followed by a slash, then a number fro...

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