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Computers

How to Find an IP Range

Finding an IP range can refer to different contexts, such as identifying the range of IP addresses for a specific subnet, looking up the range of IPs owned by a specific company or organization, or determining the range of IPs assigned by a DHCP server on a local network. Here’s how you can accomplish each:

1. Finding the IP Range of a Subnet:

If you know the subnet mask and an IP within the subnet, you can determine the range of IP addresses for that subnet.

For instance, given the IP 192.168.1.10 with a subnet mask of 255.255.255.0 (or /24):

  • The range starts at 192.168.1.0 (network address, usually not assigned to any device)
  • The range ends at 192.168.1.255 (broadcast address, also not assigned to devices)
  • Usable IPs are 192.168.1.1 through 192.168.1.254

2. Finding the IP Range of an Organization:

If you want to find the range of IP addresses owned by a specific company or organization:

  • Use a service like ARIN (American Registry for Internet Numbers) for North America, or the corresponding registry for other regions (e.g., RIPE, APNIC, AFRINIC, LACNIC).
  • Search for the company or organization’s name.
  • Review the listed IP ranges.
  1. You want to find the public IP range for a company or domain:
    • Use tools like whois. For example, in the terminal or command prompt, type whois example.com. The results will often include an IP range if the company has a range allocated.
    • There are also online services like ARIN (American Registry for Internet Numbers) where you can search for IP details.
  2. You want to know the IP range for a particular country:
    • There are databases and online services that map IP addresses to countries. These can be used to find the IP range allocated for a specific country. An example is the IP2Location website.
  3. You want to find IP ranges for cloud providers:
    • Many cloud providers (like AWS, Azure, and Google Cloud) provide lists of IP ranges used by their services. This is often for security or networking configurations. You can usually find these lists in the official documentation for each cloud provider.

Remember, while these methods can tell you the range of IPs, they don’t necessarily tell you which IPs within that range are in use or what they’re being used for.

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