What is the 172 IP range?
The address 172.16. 52.63 is a class B address. Its first octet is 172, which is between 128 and 191, inclusive. Class C networks use a default subnet mask of 255.255.
Is 172.16 a private IP range?
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 does IP address 172 mean?
In August 2012, ARIN began allocating “172” address space to internet service, wireless, and content providers. There have been reports from the community that many network operators are denying access to devices having IP addresses from within the entire 172 /8 range. As a result, any device with a 172.
Which IP address should you not use in private network?
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.
Why is subnetting important?
Subnetting ensures that traffic destined for a device within a subnet stays in that subnet, which reduces congestion. Through strategic placement of subnets, you can help reduce your network’s load and more efficiently route traffic.
How is IP range defined?
IP addresses are expressed as a set of four numbers — an example address might be 192.158. 1.38. Each number in the set can range from 0 to 255. So, the full IP addressing range goes from 0.0.
Which is the IPv4 address starting with 172?
If the 2nd octet of an IPv4 address starting with 172 is anything other than 16–31, it’s a publicly routable IP, just like almost any other. Jakob Heitz got it mostly right. It is 172.16/12, not /16. Although he is overstating things about ISPs auto-dropping things. (Perhaps they should, see more below.)
What are the IPv4 private IP address ranges?
According to standards set forth in Internet Engineering Task Force (IETF) document RFC-1918, the following IPv4 address ranges are reserved by the IANA for private internets, and are not publicly routable on the global internet: 10.0.0.0/8 IP addresses: 10.0.0.0 – 10.255.255.255 172.16.0.0/12 IP addresses: 172.16.0.0 – 172.31.255.255
Is the 172.a.b.c address valid?
There are lots of 172.a.b.c addresses which are perfectly fine. Specifically, anything not in the range Balakrishnan mentions is valid and should be routed as normal. The addresses in RFC1918 are designed to be used inside a company’s network, never to be seen on links between networks.