Classless Inter-Domain Routing, a method for allocating TCP/IP network addresses and routing data packets. Divides IP address into network id (high bits) and host id (low bits) as determined by netmask. In 1993, replaced the older classful network routing.
Questions tagged [cidr]
397 questions
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How Internet Assigned Numbers Authority (IANA) handles free ip address holes in their ip allocation pie?
Let's say an internet service provider (ISP) bought 1024 ip addresses from IANA and after 1 year that ISP business fails and it returned those ip addresses back to IANA. Now there must be a hole of free ip addresses that is created in the ip address…
Adwait Upadhyay
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What CIDR address do not overlaps with 10.0.0.0/16?
I ahve created aws VPC and try to create additional CIDR. I have always got overlaps error whever values I tried /8, /0, /16, /32:
What are correct values?
Cherry
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Using python, what's the fastest way to see which of around one million ip addresses fit into three cidrs?
I have a list of ~1,000,000 ip address strings. I want to get the set of these ip addresses that are in three cidrs (each cidr is a string like this: "1.0.0.0/25"). What is the fastest way to do this?
A) Convert the three cidrs into sets containing…
Jonathan Allen Grant
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How to fill cidr ip ranges as a bash script
Having a list of CIDR ranges in a file.
Some of them are not "well formed" in case of they are valid but some programs won't accept them.
Example: 192.168/24
Resolves to: 192.168.0.0/24
So, in this case it should be checked if there are 4 octets.
If…
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IP v 4 subnetting and addresses
Hello I am struggling working out IP address and their subnet networks. I am faced with the following question as an example I would like to know if the answers I came up with are indeed correct.
The Question is as follows
And my answers to the…
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Need a javascript to check if the subnet CIDR is in range of VPC
Error Details from AWS Example -
VPC Range as "10.0.0.0/24" with the subnet range as "10.0.38.0/24".So it should throw an alert as shown in image.
Sneha
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Compare Multiple IP Addresses to Multiple CIDRS in R
I want to determine what CIDRs my IP addresses match. I have tried using iptools but the vectors are not the same size.
Example: 192.168.100.10
CIDR match: 192.168.100.0/24 or 192.168.0.0/16
Aaron W
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