## How many addresses are in a 15?

Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References

CIDR | Subnet mask | # of IP addresses |
---|---|---|

/18 | 255.255.192.0 | 16,384 |

/17 | 255.255.128.0 | 32,768 |

/16 | 255.255.0.0 | 65,536 |

/15 | 255.254.0.0 | 131,072 |

**How do you calculate the number of subnets?**

To calculate the number of possible subnets, use the formula 2n, where n equals the number of host bits borrowed. For example, if three host bits are borrowed, then n=3. 23 = 8, so eight subnets are possible if three host bits are borrowed.

**How many subnetworks are there?**

Having 5 bits available for defining subnets means that we can have up to 32 (2^5) different subnets. It should be noted that in the past using subnet zero (00000—) and all-ones subnet (11111—) was not allowed.

### How many subnetworks and hosts are available per subnet If you apply a 27 mask?

Class A

Network Bits | Subnet Mask | Number of Hosts |
---|---|---|

/27 | 255.255.255.224 | 30 |

/28 | 255.255.255.240 | 14 |

/29 | 255.255.255.248 | 6 |

/30 | 255.255.255.252 | 2 |

**What does 16 mean in IP address?**

The `/16′ means that the first 16 binary digits is the network address, in other words, the `1.2. ‘ part is the the network (remember: each digit represents 8 binary digits). This means any IP address beginning with `1.2.

**How many addresses are in a 26?**

64 IPv4 addresses

A “/26” network provides 64 IPv4 addresses. The lower the number after the oblique, the more addresses contained in that “block”.

## How many subnetworks and hosts are available?

So 1024 subnets are available. Each subnet will have 6 bits for hosts. 2^6 = 64. We subtract 2 for the first and last address in the subnet, so 62 host addresses are available per subnet.

**How do I find out how many host addresses I have?**

The total number of IPv4 host addresses for a network is 2 to the power of the number of host bits, which is 32 minus the number of network bits. For our example of a /21 (network mask 255.255. 248.0 ) network, there are 11 host bits ( 32 address bits – 21 network bits = 11 host bits ).

**How many subnetworks and hosts are available per subnet?**

Answer: 4 bits or 2^4-2=14 subnets. How many host bits are available per subnet? Answer: 4 bits or 2^4-2=14 hosts per subnet.

### What does CIDR 16 mean?

An /16 is usually used to indicate the number of bits that are fixed (would not change) in a range of addresses of a network. That is a simpler syntax to express the CIDR. Having an IP number as 1.2. 255.1/16 means that any address from 1.2. 0.0 up to 1.2.

**How to calculate the number of subnets?**

How to Calculate Subnets. Subnets and Hosts Borrow 2 bits. S S H H H H H H # of subnets = 2 2 = 4 Subnet mask = 2 bits = 128 + 64 = 192 Range of hosts = 2 6 = 64 TT Range Useable Range Network ID 0 – 63 64 – 127 65 – 126 128 – 191 129 – 190 Broadcast 192 – 255 Address.

**How many borrowed bits are there in a subnet?**

The number of borrowed bits varies and is specified by the subnet mask. A given network address can be broken up into many subnetworks. For example, 192.168.1.0, 192.168.2.0, 192.168.3.0, and 192.168.4.0 are all subnets within a network 192.168.0.0.

## How many hosts and subnets can I have in one subnet?

When performing IP subnetting we will refer to the picture shown below which is very handy in this process. So our original subnet mask was 255.255.255.0 and we allocated 3 bits from the host portion which allowed us to have 8 subnets and 30 hosts within each subnet.

**What information does this calculator return about IPv4 and IPv6 subnets?**

This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.