Is a Class B IP address private?
Emma Martin
Published Feb 24, 2026
Is a Class B IP address private?
Reservation of IP addresses in Class B networks An important IP address reservation in Class B IPv4 addresses is private networks, from 172.16. Networks belongs to “Class B” from 172.16. 0.0 to 172.31. 0.0 are reserved for private use and can be used inside any organization.
Are Class B addresses public?
Class B Public & Private IP Address Range Class B addresses are for medium to large sized networks. The 16 bits in the third and fourth octet represent host ID and allows for approximately 65,000 hosts per network. Class B network number values begin at 128 and end at 191.
Is 192.168 private or public?
Difference between Private and Public IP address:
| PRIVATE IP ADDRESS | PUBLIC IP ADDRESS |
|---|---|
| Range: 10.0.0.0 – 10.255.255.255, 172.16.0.0 – 172.31.255.255, 192.168.0.0 – 192.168.255.255 | Range: Besides private IP addresses, rest are public. |
| Example: 192.168.1.10 | Example: 17.5.7.8 |
Is 172.16 a private IP address?
The 172.16. 0.0/12 private network can be interpreted either as a block of 16 class B network IDs or as a 20-bit assignable address space (20 host bits) that can be used for any sub-netting scheme within the private organization. 0.0/12 private network allows the following range of valid IP addresses: 172.16.
What are Class B IP addresses used for?
Class B IP addresses are used for medium and large-sized networks in enterprises and organizations. They support up to 65,000 hosts on 16,000 individual networks. Class C addresses are most common and used in small business and home networks. These support up to 256 hosts on each of 2 million networks.
What is a Class B address?
Class B Address An IP address which belongs to class B has the first two bits in the first octet set to 10, i.e. Class B IP Addresses range from 128.0. x.x to 191.255. x.x. The default subnet mask for Class B is 255.255. Class B has 16384 (214) Network addresses and 65534 (216-2) Host addresses.
Which IP address is a private address?
And don’t be surprised if you have a device or two at home with a so-called 192 IP address, or a private IP address beginning with 192.168. This is the most common default private IP address format assigned to network routers around the globe.
Which IP addresses are considered to be private addresses?
Private addresses include IP addresses from the following subnets:
- Range from 10.0. 0.0 to 10.255. 255.255 — a 10.0.
- Range from 172.16. 0.0 to 172.31. 255.255 — a 172.16.
- A 192.168. 0.0 to 192.168. 255.255 range, which is a 192.168.
- A special range 100.64. 0.0 to 100.127. 255.255 with a 255.192.
Which IP address is public?
A public IP address is an IP address that can be accessed directly over the internet and is assigned to your network router by your internet service provider (ISP). Your personal device also has a private IP that remains hidden when you connect to the internet through your router’s public IP.
Which IP address should you not use in private network?
In April 2012, IANA allocated the block 100.64.0.0/10 (100.64.0.0 to 100.127.255.255, netmask 255.192.0.0) for use in carrier-grade NAT scenarios. This address block should not be used on private networks or on the public Internet.
Are 172 IP addresses private?
Note that only a portion of the “172” and the “192” address ranges are designated for private use. The remaining addresses are considered “public,” and thus are routable on the global Internet.
Is 172.31 a private IP?
One block of private IP space (172.31. 0.0/17) is routable between the ITS core network and Dearborn. One block of private IP space (172.31. 128.0/17) is routable between the ITS core network and Flint.
What is the address range of a Class B network address?
The range of a Class B network address is 128-191.
What is an example of a Class B IP address?
The first 16 bits (the first two octets) identify the network and the remaining 16 bits indicate the host within the network. An example of a Class B IP address is 168.212.226.204 where “168.212” identifies the network and “226.204” identifies the host on that network.
Which is a Class B IP address?
Class B addresses are IP addresses that are assigned to network devices, such as computers, and include all addresses in which the first two bits of the first octet are 10. This includes all values from 10000000 to 10111111, or 128 to 191.
What is a Class B network?
A Class B network was a network in which all addresses had the two most-significant bits set to 1 and 0 respectively. For these networks, the network address was given by the next 14 bits of the address, thus leaving 16 bits for numbering host on the network for a total of 65536 addresses per network.