A utility that helps in calculating IP subnets. Written in python, totally command line driven and platform independent. The Subnet Calculator (SC) by Dx21 is a utility designed to assist in the discovery of appropriate subnetting schemes for your network. The SC can find the appropriate subnet mask (with range information) for Class A, B, and C networks, based on input from you, such as how many segments are required, or how many computers per segment you require. Free TCP/IP Network Calculators. Includes web-based Subnet, Supernet and network / node calculators.
How To Use
To use: Input IP Address in dotted-decimal format (e.g. 10.0.0.1). Classful calculation is based on classful network addressing architecture. Classful networking was used until the introduction of CIDR (classless inter domain routing). Calculations are given instantly when typing. Invalid input gives no results. Calculator will assume that unfinished IP addresses end with zeros. Network class will be determined automatically. Only Network classes A,B and C will calculate results. For classes network calculations, please use CIDR calculator, for route aggregation, please use Supernet calculator.
| Class | First octet range | Leading bits | Number of subnets | Number of hosts |
|---|---|---|---|---|
| Class A | 1-126 | 0 | 128 (27) | 16777216 (224) |
| Class B | 128-191 | 10 | 16384 (214) | 65536 (216) |
| Class C | 192-223 | 110 | 2097152 (221) | 256 (28) |
Select Mask in dotted-decimal format or by adjusting network bits or max sub-networks you want.
Feature list:
- Provides calculations using IP address and Mask (sub-net bits, max networks, host bits, max hosts);
- Subnet ID, Broadcast, Host addresses, Wildcard mask and class bit usage bitmap are provided as calculation results;
- Optional RFC 3021 support.
Address
Internet Protocol Address (or IP) are used by network devices as host identifiers for communication with other network devices using Internet Protocol. Internet Protocol version 4 (IPv4) are 32-bit binary numbers, usually represented in human-readable dotted-decimal format (e.g. 78.84.160.206). Certain IP addresses are reserved by the Internet Assigned Numbers Authority (IANA) for special use and cannot be used as host addresses (listed in RFC 5735). To convert IP address value between binary, decimal and hex, please use IP conversion.
Mask
The MASK is binary number (also usually represented in dotted-decimal format) used to separate network and host parts in IP address. IPv4 subnet mask is 32 bits large. In a valid subnet mask network part is represented with '1' from left side followed and ended by host part '0' - 11111111.11111111.11111111.00000000 (binary form), 255.255.255.0 (dotted-decimal form) or simply '/24' (where 24 represents that subnet network part is 24 bits long). Subnet calculator allows calculation for 255.255.255.254.
Host Bits
Subnet bits are the number of bits used to identify subnet. IP network is divided into network prefix and host identifier. Host bits are there to identify hosts and it is divided into subnet and host identifier.
| Subnet mask | |||
| IP address | Network | Hosts | |
| IP address | Network | Subnet | Hosts |
Max Networks and Hosts
Maximum number of subnets and hosts available in the specified subnet mask.
- Max Subnets = 2subnet_bits
- Max Hosts = 2host_bits - 2 (subtraction of network and broadcast addresses. Exceptions are subnets with /31 subnet mask where there is no subtraction part)
Network ID
This is the Reserved Address that represents the Network. It is destination part of the IP routes and it cannot be assigned to host as an identifier. Network ID is calculated by using bitwise AND between IP address and subnet mask.
Broadcast Address
Reserved address that is used to target all devices in given network. It cannot be assigned to the host. Broadcast address is calculated by performing bitwise NOT on subnet mask:
then using bitwise OR between inverted subnet mask and IP address:Host Addresses
Address range calculation: network ID + 1 to broadcast - 1
Wildcard Mask
Wildcard mask is calculated by Inverting the Subnet Mask:
Class Bit Usage
Visually see network prefix, subnet and host bits structure in the given IP address. 'n' stands for network part of the network, 's' - subnet part and 'h' - host part.
Subnet Calculator Jodies
Options
Download kindle cloud reader for mac. Whether to use /31 or 255.255.255.254 subnet mask specified in RFC 3021
There are a lot of subnet calculators out there. What makes Pinkie’s SubnetCalc unique is its level of details and the amount of information you get back as well as the flexibility to customize the way information is displayed to you.
Subnetcalc.php
How to download mods for sims 4 mac. First and foremost, Pinkie’s SubnetCalc is the first subnet calculator to capture both IPv4 & IPv6 details and present it to you on a well designed screen.
Once again, Pinkie is smart enough to figure out whether it’s dealing with IPv4 or IPv6 and display the appropriate information. Whether you want to find the Network ID, Broadcast ID, Wildcard Mask, address range or block size, Pinkie will calculate that and display them all to you.
If you want to learn more about IPv6, Pinkie is a must have tools. Besides the subnet calculator, Pinkie also gives you the ability to learn more about the address type you are dealing with. Mac os sierra download for virtualbox. When you enter an ip address, Pinkie will analyze it, then activate the Tell Me More button whose role is to get you more information about the address in question.
One of the most confusing aspect of an IPv6 address is all the variants of the same IP address. When you enter an IP address, Pinkie’s SubnetCalc will display all the variants to you; whether it be a shorten address (compressed), expanded or in alternative format.
Oh, have I mentioned that the SubnetCalc is intelligent enough to figure out any type of address you throw at it and in whatever format you might use (be it IPv4, IPv6, anycast, unicast, teredo, IPv4 compatible, IPv4 mapped, compressed or not…)
Intrigured? Download Pinkie and try it out.