Generate Random IP Addresses – catonmat.net
Last updated
1 week ago
I often have to generate random IP addresses so I created this simple online utility that does it for me. It lets you generate however many random IPv4s you need from any IP range. It works in the browser and is powered by alien technology from the future.
Random Ip Generator Options
Random Ip Generator Examples (click to try! )
How Does This Random Ip Generator Work?
This random IP generator works entirely in your browser and is written in JavaScript. The first step it takes in generating random addresses is processing the input options. In the options, you can enter startIp and endIp IP version 4 values. They consist of four octets (8-bit values) that are in the form a. b. c. d. Each octet takes values from 0 to 255 and they can be converted to a single decimal value using the formula a×256×256×256 + b×256×256 + c×256 + d. This formula can also be written as a<<24 + b<<16 + c<<8 + d. This way, integer values startIpDec and endIpDec are created. Then, it checks if generating private addresses is allowed (private addresses are 0. 0. 0, 10. 0, 176. 12. 0, or 192. 168. 0). If all of them are allowed, then it creates a range [startIpDec, endIpDec]. If any of private addresses are disabled, then for each disabled private address range, it cuts it out from the interval [startIpDec, endIpDec], creating multiple smaller ranges [[start1, end1], [start2, end2], …]. There can be up to four such smaller ranges (there are exactly four when all private addresses are prohibited). To generate a random IP address from the allowed ranges, the program calls the () function twice. First, it randomly selects one of the ranges and then randomly selects a number from this range. After generating count random addresses, it converts the numerical IP form back to the dotted form. The formula for individual octets is the following: a = (dec>>24)&0xff, b = (dec>>16)&0xff, c = (dec>>8)&0xff, d = dec&0xff. If a non-decimal base is selected, then it converts each octet to the new base using the library. It first creates a big number for each octet: a = new BigNumber(a) and then turns it into a string in the desired base by calling a = String(base). After getting all octets in the required base, it concatenates them with the octetSeparator character (can be set in options) and then prints all addresses to the screen by placing the ipSeparator character (also can be set in options) between them.
Created by Browserling
This random ip generator was created by me and my team at Browserling. Behind the scenes, it’s actually powered by our web developer tools that are used by millions of people every month. Browserling itself is an online cross-browser testing service powered by alien technology. Check it out!
Secret message: If you love my tools, then I love you, too! Use coupon code TOOLLING to get a discount at my company.
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Random IP Generator – Browserling
World’s simplest online random IP generator for web developers and programmers. Just press the Generate IPs button, and you’ll get as many random IPs as you need. Press a button – get a bunch of random Internet Protocol numbers. No ads, nonsense, or garbage.
Looking to change your IP? Try Browserling – get a browser with a random IP.
Using a Random IP Generator in Cross-browser Testing
A random IP generator can be useful if you’re doing cross-browser testing. For example, if you have written JavaScript code that implements an IP-based access control list, then you can generate a bunch of random IPs and check if your code is correct in multiple browsers. Another example is generating private range IP addresses (from 10. 0. 0 to 10. 255. 255) for use in network tests, and another example is generating random IPs for scripting.
Pro tip: You can use? input=text query argument to pass text to tools.
Generate a Random IP
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Pro tips
Master online randomization tools
You can pass options to this tool using their codes as query arguments and it will automatically compute output. To get the code of an option, just hover over its icon. Here’s how to type it in your browser’s address bar. Click to try!
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Frequently Asked Questions about ip address generator
Can I generate an IP address?
In the left menu, click Network > Public IP. Click Create. Select whether you want to create an IPv4 or IPv6 address. Select a server to which you want to assign the new IPv4 or IPv6 address.
How do you generate random IPs?
Random Ip Generator OptionsAllow 0.0.0.0. Generate IP addresses in range 0.0. 0.0 – 0.255. 255.255.Allow 10.0.0.0/8. Generate IP addresses in range 10.0. 0.0 – 10.255. … Allow 172.16.0.0/12. Generate IP addresses in range 172.16. 0.0 – 172.31. … Allow 192.168.0.0/16. Generate IP addresses in range 192.168. 0.0 – 192.168.
How do I get an IP address?
Open the Windows Start menu and right-click “Network.” Click “Properties.” Click “View Status” to the right of “Wireless Network Connection,” or ”Local Area Connection” for wired connections. Click “Details” and look for the IP address in the new window.Sep 26, 2019