Generating all IP addresses in the IPv4 Range

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What would be a efficient way to generate all possible IP v4 addresses? other than iterating all bytes in a one giant nested for loop.

Edit: My previous answer would have gone from 128.0.0.0 to 255.255.255.255 to 0.0.0.0 to 127.255.255.255. Presumably you want to go from 0.0.0.0 to 255.255.255.255, so I've edited my solution to do that.

int i = -1;
do {
  i++;

  int b1 = (i >> 24) & 0xff;
  int b2 = (i >> 16) & 0xff;
  int b3 = (i >>  8) & 0xff;
  int b4 = (i      ) & 0xff;

  //Now the IP is b1.b2.b3.b4

} while(i != -1);

Note: if you're confused how this loop will ever end (i.e. how adding 1 to -1 enough times makes it -1 again), read up on two's complement. Basically, adding one to Integer.MAX_VALUE results in Integer.MIN_VALUE, and does not throw any kind of exception.


Old answer. Still hits all IPs, but probably not in the order you desire:

for(long n = Integer.MIN_VALUE; n <= Integer.MAX_VALUE; n++)
{
  int i = (int)n;

  int b1 = (i >> 24) & 0xff;
  int b2 = (i >> 16) & 0xff;
  int b3 = (i >>  8) & 0xff;
  int b4 = (i      ) & 0xff;

  //Now the IP is b1.b2.b3.b4
}

Please note: If the loop control variable was an int instead of a long, this would be an infinite loop (since all ints are always <= Integer.MAX_VALUE).

IP address, An Internet Protocol address (IP address) is a numerical label assigned to each device Internet Protocol version 4 (IPv4) defines an IP address as a 32-bit number. Typically, a network administrator will divide a block into subnets; for example, many home routers automatically use a default address range of 192.168.0.0� 2. Not all IP addresses are valid (and there are plenty of addresses which you probably don't intend to go over). For an example of what IP addresses are valid, take note that all addresses between 224.0.0.0 and 239.255.255.255 are multicast addresses, all addresses starting with 127.x.x.x are invalid, etc.

Not all IPv4 addresses are valid, depending on what purpose they're intended for. See the section on reserved address blocks and the linked RFCs here: http://en.wikipedia.org/wiki/IPv4

So depending on what you want to do, you might need to check for reserved addresses and leave them out.

IPv4 address exhaustion, IPv4 address exhaustion is the depletion of the pool of unallocated IPv4 addresses. Because The IP address space is managed globally by the Internet Assigned Numbers Authority All RIRs have exhausted their address pools, except those reserved for IPv6 transition; this "IPv4 Address Report, daily generated". Generating all IP addresses in the IPv4 range using C [closed] I would like to generate all possible IPv4 IP addresses from 0.0.0.0 to 255.255.255.255 I tried

All Possible? 0.0.0.0 to 255.255.255.255 which is 0 to 0xFFFFFFFF

[PDF] IP Address Basics CIDR Blocks Subnet Masking, The most common form of IP address is IPv4, which is displayed as four numbers, When creating a range, IP addresses are organized sequentially. Similarly, a CIDR block of /16 will block all IP addresses that do not match the first 16 bits� Random IP Generator. Use this online random IP generator to generate a list of random IP addresses in the format 123.123.123.123 (IPv4 addresses). By default 10 random IP addresses are generate, you can change this number below.

You can start with an unsigned int/long (32-bit data type) initialized to zero and keep incrementing until you reach 0xffffffff.

The increment operator is usually slightly more efficient than nested loops.

Use bit masks and bit shift operators to pull out any given byte that you are interested in.

Program to generate all possible valid IP addresses from given string, Generate all the possible combinations using looping through the string. If IP is found to be valid then return the IP address, else simply return� Modifying IPv4 Address Ranges. You can modify settings for the DHCP range. You can also define an exclusion range to prevent the appliance from assigning the addresses in the exclusion range to clients. IP addresses in an exclusion range are excluded from the pool of IP addresses. For more information, see About Exclusion Ranges.

In terms of "efficiency", I don't think there is a much better way than looping through all possible values.

Do take note of two things: 1. There are a lot of addresses, so it won't be that efficient. 2. Not all IP addresses are valid (and there are plenty of addresses which you probably don't intend to go over).

For an example of what IP addresses are valid, take note that all addresses between 224.0.0.0 and 239.255.255.255 are multicast addresses, all addresses starting with 127.x.x.x are invalid, etc.

IP Calculator / IP Subnetting, ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. You can see two simple facts: In a network address all host bits are zero, in a broadcast address Originally ipcalc was not intended for creating HTML and still works happily in /usr/local/bin/ :-). IPv4 Address, its Classes, and its range | IPv4 Address is a 32-bit address and It is divided into various classes namely Class A, Class B, Class C, Class D and Class E. This is post is all about basics of IPv4 and range of IPv4 Address in networking. The Class A IP Address range is from 0-126

Designing an IPv4 Addressing Scheme, The book discusses a broad range of Internet Protocol (IP) network administration topics. Unique IPv4 addresses for the interfaces of every system on the network. Refer to Creating the Network Mask for IPv4 Addresses for details. Approach: Split the string with ‘ . ‘ and then check for all corner cases. Before entering the loop, check the size of the string. Generate all the possible combinations using looping through the string. If IP is found to be valid then return the IP address, else simply return the empty list. Below is the implementation of the above approach:

ipaddress — IPv4/IPv6 manipulation library — Python 3.8.5 , This is the full module API reference—for an overview and introduction, see An Return an IPv4Address or IPv6Address object depending on the IP address consisting of four decimal integers in the inclusive range 0–255, separated by dots� IP Address & Range Calculator Use this calculator if you have a list of IP addresses or IP ranges you want to sort, deduplicate, or ensure that another set of IP ranges is excluded (e.g. whitelist / blacklist). The calculator will evaluate the shortest possible representation of the these IP addresses as network blocks. Description IP Adress

[PDF] IP Addressing Guide, IP version 4 (IPv4) addresses, which uniquely identify a device on an IP network, are 32 bits in length and are IP version 6 (IPv6) is the next generation of IP addressing. IPv6 All voice could be on its own subnet range from the 10.0.0.0/8 or. Used for link-local addresses between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server. 172.16.0.0/12 172.16.0.0–172.31.255.255

Comments
  • @S. Mark: no, but it doesn't matter. the & 0xff will remove the sign bit. The loop could have been from 0 to -1 (since -1 == 0xffffffff). It would still work because Integer.MAX_VALUE + 1 === Integer.MIN_VALUE
  • @S.Mark: i'm not sure if this is what you were getting at, but he probably wanted to go from 0 to 0xffffffff. i've updated my answer to do that
  • Yes all possible valid IP addresses from beginning to end.
  • I see, May I know the purpose of doing that? for checking valid IP?
  • Ah, I see, to do a Assigned IP address map, you will need some of data resources which I dont have in my ref links for now.