格 千格 KiloCell

IP subnet calculator

Online network segmentation, CIDR planning and IPv4 query

• Network address details

Chile -
Radio Address -
Subnet mask -
Sphere mask -

• Hosts and Numbers

Number of hosts available -
Total IP Number -
First available IP -
Last available IP -
IP binary: -
Mask binary: -
■ Network   ■ Host (Host)

Depth resolution: subnet calculations of core values in network architecture

How to scientifically divide IPs when building medium-sized and large networks Address sections are the primary task of each network administrator. Subnetting is not just about solving IP The issue of de-drinking addresses is more about improving the efficiency, security and performance of the network. By breaking a large network into several logic subnets, you can better control traffic flow and access strategies.

What is CIDR?

Traditional A/B/C network divisions (e.g., fixed 255.255.255.0) are no longer applicable. CIDR is expressed by slash (e. g. /24 The flexible definition of network space length has greatly increased the use of address space. By adjusting the CIDR Prefixes are used to create various subnets that contain 2 hosts (/31) to millions of hosts (8).

Key elements of the subnet calculation

  • Chile The smallest IP in the subnet, representing the subnet itself. In the route sheet, the data pack is forwarded for decision-making based on the web address.
  • Radio address: The largest IP in the subnet. The package sent to that address will be received by all hosts in the subnet.
  • Available host range: After excluding the network address and the broadcast address, you can really assign an IP address to the device.
  • Sphere mask: Access Control List (ACL), which is used mainly for equipment such as Cisco, is the backcode for the subnet mask.

How can practical problems be solved through subnet segmentation?

Scenario one: traffic isolation. If all equipment within the company is in the same large segment, the broadcasting traffic will result in a severe decline in performance. You can divide the Treasury Department through the subnet calculator. /26 Subnet, divided between R & D /24 Subnets, thus achieving logical isolation.

Scenario 2: VPN group network configuration. When configure a peer connection (P2P) or site to a site VPN, ensure private IPs at both ends Address segments do not conflict. This tool helps you quickly check whether the two CIDR sections overlap and avoid a path conflict.

Expert tip: Choose the right mask

For small offices or family laboratories, usually used /24 (254 hosts available). Microservice communications within cloud servers are available /30 or /31 to save address resources. In planning, it is proposed to leave 20% of the redundancy space to cope with future business growth.