Network Tools
Calculate the usable IP range, network address, broadcast, and host count from CIDR input.
Use this free IP Range Calculator to find the network address, first usable IP, last usable IP, broadcast address, subnet mask, and total host capacity for an IPv4 subnet. It is useful for subnetting practice, network planning, VLAN design, firewall rules, access lists, lab work, and quick troubleshooting when you need to understand exactly which IP addresses belong to a subnet.
Use this free IP Range Calculator to find the network address, first usable IP, last usable IP, broadcast address, subnet mask, and total host capacity for an IPv4 subnet. It is useful for subnetting practice, network planning, VLAN design, firewall rules, access lists, lab work, and quick troubleshooting when you need to understand exactly which IP addresses belong to a subnet.
Use ip range calculator when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
IP Range Calculator is for subnet math and range planning. My IP Address is for identifying the current public IP that a device or connection is using. If your question is "what subnet does this belong to?", use the range calculator. If your question is "what is my current public IP?", use the IP address tool.
IP Range Calculator tells you the subnet boundaries and usable hosts. IPv4 Validator only checks whether an IPv4 address is syntactically valid. If you need planning and subnet details, the calculator is the better fit.
If you need to confirm the format of an address first, use IPv4 Validator. If you want to check the public IP currently visible to the internet, open My IP Address. If you are troubleshooting a domain or server after subnet planning, you may also want DNS Lookup or WHOIS Lookup.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
192.168.1.10/24
Output
Network: 192.168.1.0 Broadcast: 192.168.1.255 Usable range: 192.168.1.1 - 192.168.1.254
Useful for common LAN subnets where almost the entire last octet is available for hosts.
Input
10.0.0.5/30
Output
Network: 10.0.0.4 Broadcast: 10.0.0.7 Usable range: 10.0.0.5 - 10.0.0.6
Helpful for understanding very small subnets often used on routed links.
Input
172.16.5.20/16
Output
Network: 172.16.0.0 Broadcast: 172.16.255.255 Usable range: 172.16.0.1 - 172.16.255.254
Useful when checking large internal networks with many available hosts.
Input
192.168.50.33/27
Output
Network: 192.168.50.32 Broadcast: 192.168.50.63 Usable range: 192.168.50.33 - 192.168.50.62
Helpful when designing smaller VLANs or branch office segments.
Input
10.25.7.99/8
Output
Network: 10.0.0.0 Broadcast: 10.255.255.255 Usable range: 10.0.0.1 - 10.255.255.254
Useful for understanding how broad a large private range can be.
Input
203.0.113.10/29
Output
Network: 203.0.113.8 Broadcast: 203.0.113.15 Usable range: 203.0.113.9 - 203.0.113.14
Useful when working with small public IP allocations or lab ranges.
Input
192.168.1.25/32
Output
Network: 192.168.1.25 Broadcast: 192.168.1.25 Usable range: single host
Helpful when checking single-host routes, ACL entries, or exact match addresses.
Input
192.168.1.300/24
Output
Invalid IPv4/CIDR input
The calculator rejects invalid octets or malformed CIDR values.
Fix: Include the prefix length, for example 192.168.1.10/24 instead of just 192.168.1.10.
Fix: Remember that the network address identifies the subnet itself and is not normally assigned to a host.
Fix: The broadcast address is reserved for the subnet and is not normally assigned to a device.
Fix: Check the prefix length carefully because a /24, /27, and /30 have very different host capacity.
Fix: Decide whether you need a subnet range, a single host entry, or a summarized network before using the result.
An IP range calculator shows the network address, broadcast address, usable host range, and other subnet details based on an IPv4 address and CIDR prefix.
The network address identifies the subnet itself, while the first usable IP is the first address that can normally be assigned to a host.
The broadcast address is reserved for the subnet, while the last usable IP is the final host address that can normally be assigned.
Yes. It is useful for learning CIDR, subnet masks, network boundaries, and host counts.
A /30 subnet contains only four total addresses, and after reserving the network and broadcast addresses, only two are left for hosts.
A /32 represents a single host address rather than a normal multi-host subnet.
Yes. It is useful for understanding subnet boundaries when writing rules, routes, ACLs, and documentation.
Yes. The subnet math is the same whether the address belongs to a private or public range.
Yes. By checking the network boundaries, you can see whether two IP addresses belong to the same subnet.
Use a calculator when you want a fast accurate answer during planning, support work, or exam practice without doing binary subnet math by hand.