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: Show
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. Use caution when setting filters to exclude these private address ranges. In some cases, Regional Internet Registries (RIRs) have issued adjacent address space to their customers and that space is in use on the global Internet. 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.x.x.x IP address may have difficulty reaching some sites on the global Internet. The only way to solve this problem is for those operators to reconfigure their routers or firewall access controls and filter only address space from the 172.16.0.0/12 range. What is a private IP address?A private IP address is a range of non-internet facing IP addresses used in an internal network. Private IP addresses are provided by network devices, such as routers, using network address translation. Internet Protocol (IP) addresses identify a device on either the internet or a local network. IP addresses also enable information to be sent between devices on a network. Private IP addresses are commonly used for local area networks in residential, office and enterprise areas. Every device that connects to an internet network -- such as computers, smartphones, tablets or printers -- will have a private IP address. Routers need a way to identify these devices, and the devices may also need to identify each other, which is where private IP addresses come in. Private IP addresses are generated by a router for identification. Private IP addresses were originally designated to delay the exhaustion of IPv4 addresses -- one of the main types of IP addresses. Originally it was thought that IPv4's 32-bit IP addressing system -- with 4,294,967,296 theoretical IP addresses -- would be adequate for all purposes. But as more internet-connected devices were produced, it became apparent that something had to fill the gap between IPv4 and a future system. Private IP addressing and network address translation began filling that initial gap with a range of private IP addresses. Later, a new addressing system, Internet Protocol Version 6 (IPv6), was introduced. IPv6 increases IP address lengths from 32 bits to 128 bits and is 1,028 times larger than the number of IPv4 addresses. Private addresses can be assigned by the router using the Dynamic Host Configuration Protocol or be manually set, after which the addresses can communicate with one another through the router. What is a private IP address used for?Private IP addresses are commonly used for residential and corporate networks, as the addresses cannot be seen outside the private network. Internet service providers (ISPs) may also allocate a single routable IPv4 address to residential customers. To translate that one address to multiple addresses, so multiple devices can have the assigned address, a network address translator/port address translator gateway is used. This method can connect multiple hosts. Corporate networks use private IP addresses for security, since they make it difficult for an external host to connect to a system. Organizations also use private IP addresses to restrict internet access to internal users, which helps increase security. How can you check your private IP address?Most individuals do not need to know their IP address, but in some scenarios the knowledge comes in handy, such as when connecting a computer to another device on the network. The steps for finding a device's IP address differ by platform.
Other devices can be checked from the connected router. The steps to do this will differ by router, however. What are the different private IP address ranges?Private IP addressing uses both IPv4 and IPv6 addresses. Private IPv4 addresses have the following class configurations:
The range of private IP addresses seems relatively small because they can be reused on different private networks without consequence. This differs from public IP addresses, which all need to be uniquely identifiable.  IPv6 private address ranges include the following:
IPv6 addresses are written in hexadecimal, which uses four bits, meaning an IPv6 address is made up of 32 hexadecimal digits. The numbers are grouped in fours, with a total of eight blocks, or groups. What are the differences between a private and public IP address?Both public and private IP addresses have attributes indicative of their roles. For example, differences between public and private IP addresses include how private IP addresses are used for communicating within a private network, or with other devices in a home network or office. They cannot be directly contacted over the internet. Meanwhile, public IP addresses are used to communicate over the public internet, outside a private network. Public IP addresses are unique and cannot be reused unlike private IP addresses, which can be reused. Private IP addresses are assigned to a device by a router within the network, while an ISP assigns public IP addresses. In addition, public IP addresses can be any combination of numbers that do not fall within private IP address ranges. Private IP addresses also have an extra layer of security because they are only located within private networks, and not to the internet as a public IP address would be. Learn the differences between IPv4 and IPv6, and how many addresses IPv6 supports. This was last updated in July 2021 Continue Reading About private IP address
Which of the following is a private IP address range quizlet?The private address ranges are 10.0. 0.0 to 10.255. 255.255, 172.16. 0.0 to 172.31.
Why can't a computer with an RFC 1918 IP address be used as a public facing Web server?A computer with an RFC 1918 address cannot be used as a server because client requests will not reach it. Routers prevent packets with RFC 1918 address in the destination address from leaving the networks.
What Windows command can you utilize to display all TCP IP configuration information for each network adapter installed?Internet protocol configuration (ipconfig) is one of the most valuable tools used to check and troubleshoot basic TCP/IP settings and this command displays all the IP configuration details of the windows machine.
When using DHCP for IPv6 what port do clients use?DHCPv6 uses different UDP port numbers (UDP port 546 for clients and UDP port 547 for servers). DHCPv6 uses link-local (fe80::/10) IPv6 addresses when communicating between client and relay/server.
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Which of the following is not a range of ip addresses recommended for use in private networks?
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