192.168.1.0/26
- Usable range
- 192.168.1.1 - 192.168.1.62
- Broadcast
- 192.168.1.63
- Hosts
- 62
Network Planning Tool
IP Subnet & CIDR Planner
Calculate IPv4 subnet details, convert masks, inspect usable ranges, and split a parent CIDR block into smaller networks for practical deployment planning.
IPv4 network calculator
CIDR summary
Network address
192.168.1.0
Broadcast
192.168.1.255
Usable host range
192.168.1.1 - 192.168.1.254
Usable hosts
254
- Subnet mask
- 255.255.255.0
- Wildcard mask
- 0.0.0.255
- Total addresses
- 256
- Reverse DNS zone
- 1.168.192.in-addr.arpa
Child subnets
4Addresses each
64Usable hosts each
62First 4 subnets in 192.168.1.0/24
192.168.1.64/26
- Usable range
- 192.168.1.65 - 192.168.1.126
- Broadcast
- 192.168.1.127
- Hosts
- 62
192.168.1.128/26
- Usable range
- 192.168.1.129 - 192.168.1.190
- Broadcast
- 192.168.1.191
- Hosts
- 62
192.168.1.192/26
- Usable range
- 192.168.1.193 - 192.168.1.254
- Broadcast
- 192.168.1.255
- Hosts
- 62
VLSM Planner
Allocate VLANs by required host count
Enter a base CIDR and host requirements. The planner sorts networks from largest to smallest, assigns the smallest fitting subnet to each, and flags when the base range is too small.
Base network
10.10.0.0/24Required addresses
240Available addresses
256Network
Staff VLAN
- Required hosts
- 100
- Assigned CIDR
- 10.10.0.0/25
- Subnet mask
- 255.255.255.128
- Usable hosts
- 126
- Range
- 10.10.0.1 - 10.10.0.126
- Broadcast
- 10.10.0.127
Network
Guest WiFi
- Required hosts
- 50
- Assigned CIDR
- 10.10.0.128/26
- Subnet mask
- 255.255.255.192
- Usable hosts
- 62
- Range
- 10.10.0.129 - 10.10.0.190
- Broadcast
- 10.10.0.191
Network
CCTV
- Required hosts
- 30
- Assigned CIDR
- 10.10.0.192/27
- Subnet mask
- 255.255.255.224
- Usable hosts
- 30
- Range
- 10.10.0.193 - 10.10.0.222
- Broadcast
- 10.10.0.223
Network
Printers
- Required hosts
- 10
- Assigned CIDR
- 10.10.0.224/28
- Subnet mask
- 255.255.255.240
- Usable hosts
- 14
- Range
- 10.10.0.225 - 10.10.0.238
- Broadcast
- 10.10.0.239
Built for real network planning
Plan firewall rules
Convert CIDR blocks into wildcard masks, broadcast addresses, and usable host ranges before adding access lists or security-group rules.
Split address space
Choose a child prefix to divide a parent block into predictable subnets for VLANs, cloud VPCs, VPN pools, labs, or branch networks.
Check edge cases
The planner handles /31 point-to-point networks and /32 host routes explicitly so those blocks do not get treated like ordinary LAN subnets.
Allocate VLSM ranges
Enter VLAN or network names with host counts to allocate variable-size subnets from largest to smallest inside a base CIDR.
Subnet, CIDR, wildcard, and VLSM basics
What is a subnet?
A subnet is a smaller section of a larger IP network. Network engineers use subnets to separate users, servers, guest Wi-Fi, CCTV, phones, and management devices so traffic is easier to secure and troubleshoot.
What is CIDR?
CIDR is a compact way to write an IP network. A block such as 192.168.1.0/24 means the first 24 bits identify the network and the remaining bits are available for host addresses.
What is a subnet mask?
A subnet mask shows which part of an IPv4 address belongs to the network. For example, /24 is the same as 255.255.255.0, while /26 is 255.255.255.192.
What is a wildcard mask?
A wildcard mask is the inverse of a subnet mask. Cisco ACLs, OSPF networks, and some firewall rules use wildcard masks to describe which address bits can vary.
What is VLSM?
VLSM means Variable Length Subnet Masking. It lets you split one base CIDR into different subnet sizes, so a staff VLAN can receive more addresses than a printer or CCTV network.
What are /31 and /32 networks?
/31 networks are commonly used for point-to-point links where both addresses may be usable. /32 represents a single host route, often used for loopbacks, firewall objects, or exact host routing.
Subnet sizing checklist
- Start with the largest future host count, not only the number of devices today.
- Reserve spare subnets for growth, routing boundaries, and temporary migrations.
- Keep infrastructure, user, guest, voice, and management networks separate where possible.
- Document the CIDR block, gateway convention, DHCP scope, and firewall purpose together.