cidr

问题 I'm searching for a php algorithm that efficiently test if one cidr notated network overlaps another. Basically I have the following situation: Array of cidr adresses: $cidrNetworks = array( '192.168.10.0/24', '10.10.0.30/20', etc. ); I have a method that adds networks to the array, but this method should throw an exception when a network is added that overlaps with a network allready in the array. So ie. if 192.168.10.0/25 is added an exception should be thrown. Does anyone have/know/"can

问题 I am able to do this with IPv4 using code snippets from various online sources. I was wondering if there was a way to do it with IPv6. Basically I just need a form that I can enter an IPv6 address and prefix (ex: address/68) and it calculates the network address, first useable address, last useable address, and broadcast address. Then just prints to screen. Not looking to store it in a database or anything yet. How would I go about doing this? Thanks to everyone in advance! 回答1: First of all:

问题 I'm looking for quick/simple method for matching a given IP4 dotted quad IP to a CIDR notation mask. I have a bunch of IPs I need to see if they match a range of IPs. example: $ips = array('10.2.1.100', '10.2.1.101', '10.5.1.100', '1.2.3.4'); foreach ($ips as $IP) { if (cidr_match($IP, '10.2.0.0/16') == true) { print "you're in the 10.2 subnet\n"; } } What would cidr_match() look like? It doesn't really have to be simple, but fast would be good. Anything that uses only built-in/common

问题 Using Javascript (without JQuery) I'm looking to get the minimum and maximum IPs in a IPv6 CIDR prefix. For example, 2001:280::/32 would output 2001:280:0:0:0:0:0:0 and 2001:280:ffff:ffff:ffff:ffff:ffff:ffff . How can I do this? Thanks in advance! 回答1: Assuming you have Node and NPM installed: $ touch index.js $ npm init $ npm i --save ip-address $ vim index.js var v6 = require('ip-address').v6; var addr = new v6.Address('2001:280::/32'); console.log(addr.parsedAddress.join(':')); console.log

问题 Let's say I have a text file contains a bunch of cidr ip ranges like this: x.x.x.x/24 x.x.x.x/24 x.x.x.x/23 x.x.x.x/23 x.x.x.x/22 x.x.x.x/22 x.x.x.x/21 and goes on... How can I convert these cidr notations to all possible ip list in a new text file in Python? 回答1: If you don't need the satisfaction of writing your script from scratch, you could use the python cidrize package. 回答2: You can use netaddr for this. The code below will create a file on your disk and fill it with every ip address in

问题 Is there a way to get the number of IPv6 addresses from a Ipv6 CIDR? for example: CIDR: 2403:3E00::/32 => need get number of ipv6 addresses: 79228162514264337593543950336 回答1: An IPv6 address has 128 bits, of which (slightly simplified) a number are dedicated to network address, and the rest are dedicated to host addresses. In your case, 32 bits are dedicated to the network part ( /32 ), so the other 96 are dedicated to host addresses. 2^(128-32) = 2^96 = 79228162514264337593543950336 hosts

问题 I came up with this to calculate CIDR but I'm pretty sure that it isn't the most fastest way: public int MaskToCIDR(IPAddress ip) { return Convert .ToString(BitConverter.ToInt32(ip.GetAddressBytes(), 0), 2) .ToCharArray() .Count(x => x == '1'); } Test: Console.WriteLine(MaskToCIDR(new IPAddress(new byte[]{255,255,255,255}))); // 32 Console.WriteLine(MaskToCIDR(new IPAddress(new byte[]{255,255,255,0}))); // 24 Console.WriteLine(MaskToCIDR(new IPAddress(new byte[]{255,255,0,0}))); // 16 Console

问题 This question already has answers here : Datatype for storing ip address in SQL Server (10 answers) Closed last year . I have the following stored procedure that converts IPs to 32-bit binary in TSQL. It works but is EXTREMELY slow (has only converted 8,400 in 40 minutes) - probably because it uses cursors. Does anyone have suggestions and/or a different approach to improve performance? Here's an example: 1.1.79.129 is converted to 00000001.00000001.01001111.10000001 Thanks CREATE PROCEDURE

问题 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'] 回答1: You can do it in one line using netaddr: cidrs = netaddr.iprange_to_cidrs(ip_start,

问题 So I have an IP like 45.76.255.14, and I have a table with rows of CIDR stored as a single varchar, how would I select CIDRs that are in the range of that IP address. For example 45.76.255.14/31 So in theory: select CIDR where in range of IP 回答1: Storing IP addresses in dotted quad notation in a VARCHAR is not the most optimal way of storing them, since dotted-quad is a human friendly representation of a 32 bit unsigned integer that doesn't lend itself to database indexing. But sometimes it's