cidr

来源： https://stackoverflow.com/questions/64542446/choosing-a-random-ip-from-any-specific-cidr-range-in-c

来源： https://stackoverflow.com/questions/64542446/choosing-a-random-ip-from-any-specific-cidr-range-in-c

来源： https://stackoverflow.com/questions/33750233/convert-cidr-to-subnet-mask-in-python

问题 We are using the GeoLite2 database in order to implement an IP -> country lookup. For performance reasons, we want to import the CSV and convert it to our own format. The CSV is represented like this: 5.39.40.96/27,3017382,3017382,,0,0 5.39.40.128/28,3017382,3017382,,0,0 5.39.40.144/28,2635167,3017382,,0,0 5.39.40.160/27,3017382,3017382,,0,0 5.39.40.192/26,3017382,3017382,,0,0 5.39.41.0/25,3017382,3017382,,0,0 5.39.41.128/26,3017382,3017382,,0,0 5.39.41.192/26,2635167,3017382,,0,0 5.39.42.0

问题 I'd like to find a way to do a SQL query that will calculate the cidr (bit representation) of a subnet mask stored in the database. So for example, I've got either 255.255.255.0 or its decimal value (4294967040) stored in the database. I'd like to do a select and get back /24 representation via the query. I've done things like the following to determine the last IP of a subnet so I'm hoping to do something similar to determine the cidr representation of a mask. select concat(inet_ntoa(ip_addr

问题 I have a table which contains a column as CIDR values like 1.0.85.128/25 , I have 2 other columns (start_ip_range and end_ip_range), I want to populate those 2 column FROM CIDR column Java code might look like as follows: String[] parts = cidr.split("/"); String ip = parts[0]; int prefix; if (parts.length < 2) { prefix = 0; } else { prefix = Integer.parseInt(parts[1]); } String[] ipParts = ip.split("\\."); int address = ((new Integer(ipParts[0]) << 24) & 0xFF000000) | ((new Integer(ipParts[1]

问题 Given an ip address (say 192.168.0.1), how do I check if it's in a network (say 192.168.0.0/24) in Python? Are there general tools in Python for ip address manipulation? Stuff like host lookups, ip adddress to int, network address with netmask to int and so on? Hopefully in the standard Python library for 2.5. 回答1: This article shows you can do it with socket and struct modules without too much extra effort. I added a little to the article as follows: import socket,struct def makeMask(n):

问题 Given an ip address (say 192.168.0.1), how do I check if it's in a network (say 192.168.0.0/24) in Python? Are there general tools in Python for ip address manipulation? Stuff like host lookups, ip adddress to int, network address with netmask to int and so on? Hopefully in the standard Python library for 2.5. 回答1: This article shows you can do it with socket and struct modules without too much extra effort. I added a little to the article as follows: import socket,struct def makeMask(n):

问题 Does someone have a good example of a way I could take a IP address with a CIDR such as 192.168.1.1/24 and return all the ip addresses inside of that range such as 192.168.1.1, 192.168.1.2, 192.168.1.3 ... I'm fine with it being returned in a array of unsigned long , a char or just something like /* Pseudocode */ while(currnetip <= finalip) { print(currnetip); currnetip++; } As long as I can understand it its fine. Feel free to comment a link to a post if you think it could help me. Edit:

问题 I've been working on an algorithm for converting an IP Range to a list IPs in CIDR Notation (will be mentioned as tuples henceforth). Now, what puzzles me is figuring out what is the Worst Case Scenario for this conversion; What is the maximum number of tuples I can get for an IPv4 Range? What is the maximum number of tuples I can get for an IPv6 Range? How was this calculated?erp I'm using a modified C version (which is not recursive) of the following Python script: 1 #!/usr/bin/env python 2