cidr

It's simple enough to code up a class to store/validate something like 192.168.0.0/16 , but I was curious if a native type for this already existed in .NET? I would imagine it would work a lot like IPAddress : CIDR subnet = CIDR.Parse("192.168.0.0/16"); Basically it just needs to make sure you're working with an IPv4 or IPv6 address and then that the number of bits your specifying is valid for that type. No there is such native type in .NET, you will need to develop one your self. Koen Zomers You can use the code from CodePlex to do just that: http://ipnetwork.codeplex.com/ IPNetwork ipnetwork

I want to do two things: Convert IP Address inputs into CIDR Here are some example inputs: 1.1.1.1 192.168.*.* #=> 192.168.0-255.0-255 192.168.1.2-20 1.1.1-10.1-100 Check if a given IP Address falls into any CIDR. This must be a very fast query, as it's a very common lookup in my web app. I'm thinking of doing something like this: def matches?(request) valid = @ips.select {|cidr| cidr.contains?(request.remote_ip) } !valid.empty? end I think converting IP ranges into CIDR will let lookups be faster than what we're doing now, which is breaking the IP's into integer octets. We then index the

I have a text file with IP addresses in cidr format. One cidr per line. How do I convert the cidrs to IP ranges i.e start IP - end IP. One IP range per line. Please note the space on either side of the - . You'd better use ipcalc : ipcalc 192.168.0.1/24 -nb | awk '/HostMin/{min=$NF} /HostMax/{max=$NF} END {print min" - "max}' 192.168.0.1 - 192.168.0.254 A simple script to loop through the file: #!/bin/bash cat file.txt |\ while IFS= read ip; do ipcalc "$ip" -nb |\ awk ' /HostMin/{min=$NF} /HostMax/{max=$NF} END {print min" - "max}' done 来源： https://stackoverflow.com/questions/28742839/cidr

Any have any good code for converting a IPv6 address string into an integer? Converting IPv4 seems to be fairly easy, with the one format. However, IPv6 has several different formats to show an address: XXXX:XXXX:XXXX:XXXX:: XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX XXXX:XXX:XXXX:0:0:XXXX:XXX:XXXX XXXX:XXX:XXXX::XXXX:XXX:XXXX ::ffff:XXXX:XXX (IPv4 in v6 format) ::ffff:###.#.#.### (also valid IPv4 in v6 format) I'd like to be able to take one of these strings and translate it into an INTEGER for IP-to-network matching, and allow for any of these formats as the input. Ended up rolling my own. Also

How do I convert a list of IP addresses to a list of CIDRs? Google's ipaddr-py library has a method called summarize_address_range(first, last) that converts two IP addresses (start & finish) to a CIDR list. However, it cannot handle a list of IP addresses. Example: >>> list_of_ips = ['10.0.0.0', '10.0.0.1', '10.0.0.2', '10.0.0.3', '10.0.0.5'] >>> convert_to_cidr(list_of_ips) ['10.0.0.0/30','10.0.0.5/32'] CaTalyst.X You can do it in one line using netaddr: cidrs = netaddr.iprange_to_cidrs(ip_start, ip_end) paragbaxi Install netaddr. pip install netaddr Use functions of netaddr: # Generate

I have been handed the task of creating a function in python (3.1) that will take a CIDR notation and return the list of possible ip addresses. I have looked around python.org and found this: http://docs.python.org/dev/py3k/library/ipaddr.html but i haven't seen anything that will fill this need... I would be very grateful for any assistance anyone cares to kick my way. thanks in advance. :-) If you aren't married to using the built-in module, there is a project called netaddr that is the best module I have used for working with IP networks. Have a look at the IP Tutorial which illustrates how

Is there a good way to match an IPv6 address to an IPv6 subnet using CIDR notation? What I am looking for is the IPv6 equivalent to this: Matching an IP to a CIDR mask in PHP 5? The example given above can't be used since an IPv6 address is 128 bits long, preventing the bitwise left-shift from working properly. Can you think of any other way? EDIT: Added my own solution to the list of answers. Since you cannot convert IPv6 addresses to integer, you should operate bits, like this: $ip='21DA:00D3:0000:2F3B:02AC:00FF:FE28:9C5A'; $cidrnet='21DA:00D3:0000:2F3B::/64'; // converts inet_pton output to