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Private IP Address. You can use any private IP address range within your private network. A private network can use both IPv4 and IPv6 addresses. Private IP ranges are NOT allocated to any particular organization. Private IP Ranges specified by RFC 1918 Class A: 10.x.x.x - 10.255.255.255 (CIDR - 10.0.0.0/8),255.0.0.0, 24 bit block
The reasons for the three address ranges are found in RFC 1918, Address Allocation for Private Internets: If a suitable subnetting scheme can be designed and is supported by the equipment concerned, it is advisable to use the 24-bit block (class A network) of private address space and make an addressing plan with a good growth path.
1. When it comes to local networks, you have the freedom to use any IP address you want for your network since it doesn't need to communicate on the internet with other devices. However, the RFC specified a range for private IP addresses (such as 10.x.x.x and 192.168.0-255.x).
Included in the policy is the list of trusted sites. These include: Approved company addresses. Various external addresses such as our bank. Private addresses 192.168.0.0/16, 172.16.0.0/20 and 10.0.0.0/24. Everything else is blocked. Due to the security policy, the ActiveX component never received any data as the incoming traffic is blocked by ...
I've read the below thing, in a website. 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.
IPv6 does not have Private addresses the way IPv4 does. There once was IPv6 Site Local addressing (fec0::/10), but that was deprecated in favor of Unique Local Addressing (fc00::/7). ULA goes a long way to solving the problem presented by IPv4 Private addressing where it is very common for different sites to use the same Private addressing.
RFC 1918, Address Allocation for Private Internets (February 1996, after the public Internet went commercial) defined private addressing. There was a law firm that was forced to surrender some addressing for the 172.16.0.0/12 private address range.
Just because an IP address is not in one of the private address ranges does not mean it is a public address. There are other ranges which cannot be globally routed, and so they are not public addresses. See IANA IPv4 Special-Purpose Address Registry. –
RFC 1918 defines private IP address ranges. Have a look here. From that document: Private Address Space. The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets: 10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix) This is why you would see them utilized for devices on the local network. The reasoning behind at least parts of each of these three "private" address ranges is fairly straightforward, but again outside of logic, these are guesses based upon my readings over the years.