Private Ips
What is a Private IP Address?
If you were searching for information on an IP address such as 192. 168. 1. 1 or 10. 0. 1, you’re on the right page. Because you’re about to learn something that confuses almost anyone trying to learn about IP addresses.
But if you read on, you’ll see it doesn’t have to be confusing.
This article is about what private IP addresses are. Before you learn about private IP addresses, you will also need to know about public IP addresses, which you should know a little about already if you’re reading this article. Lucky for you, that’s something fairly easy to explain.
The IP address you see on our home page—that looks like this—24. 156. 99. 202, is an example of a public IP address. If you’ve ever wondered “what is a public IP, ” now you know. It’s that simple.
Now, about that other kind of IP address…
What’s a Private IP address?
Home routers have their local address set to a default, private IP address number. It’s usually the same address for the other models from that manufacturer, and it can be seen in the manufacturer’s documentation.
Who knew?
Actually, you should welcome your private IP
Here’s a look at the default private (also called “local”) IP addresses for popular brands of routers:
Linksys routers use 192. 1
D-Link and NETGEAR routers are set to 192. 1
Cisco routers use either 192. 10. 2, 192. 254 or 192. 1
Belkin and SMC routers often use 192. 2. 1
Let’s go back to public IP addresses for a second…
How you connect to the world.
Your public IP address is the IP address that someone on the other end of your Internet activity would see (if they bothered to look for it). That’s the only reason it’s known as a public IP address.
With traditional mail, when you send a letter, you have to know the address to send it to—such as “1234 Main Street, ”—so that the postman knows which street and which house to take it to.
The Internet works similarly, except it directs your personal activity (emails, answers to Google inquiries, etc. ), and forwards the electronic messages to your computer’s address.
You couldn’t do much without a public IP address. It’s your passport to the Internet.
Public and Private. Working together to get you connected.
In theory, your computer must have its own unique IP address so that it will only receive the information that is meant for you.
However, that’s not how it works out, because of one major exception—network computers that are linked to a router and share the same public IP address.
Yes. If you have a router, you have a private IP address.
And here’s how it works…
Reserved for private networks.
The organizations that distribute IP addresses to the world reserves a range of IP addresses for private networks.
192. 0 – 192. 255. 255 (65, 536 IP addresses)
172. 16. 0 – 172. 31. 255 (1, 048, 576 IP addresses)
10. 0 – 10. 255 (16, 777, 216 IP addresses)
Your simple home network, with its router at the center and computers connected to it—wired or wireless—classifies as one of those networks.
Your router—once it makes its Internet connection through your Internet Service Provider—sends Internet activity to any computer connected to your router, and is the basis of a networking innovation called a Network Address Translation (NAT).
NAT is a process in which your router changes your private IP Address into a public one so that it can send your traffic over the Internet, keeping track of the changes in the process.
When the information comes back to your router, it reverses the change—from a real IP address into a private one—and forwards the traffic back to your computer.
In other words, the router connects to the other devices (usually desktops, laptops and tablets).
Your private IP is just that. Private.
That’s the point: Your private address is just for your router, your network, and you.
The private address ranges in a network don’t have to be synchronized with the rest of the world and the Internet.
As a matter of fact, the private address range can be used by more than one address. A network administrator using these private addresses has more room for subnetting, and many more assignable addresses.
The private IP address does one job for your home network.
These blocks of addresses can be used by a private network. Even if your neighbor is using the exact same addresses, it won’t cause a problem, because that’s HIS or HER network, not yours.
Don’t let that confuse you.
You see, these private addresses are known as non-routable addresses. The networking on the Internet routes Internet activity connected to your public IP address only, not your private IP.
How Private and public IP addresses work together.
Four key takeaways
To wrap up our discussion about public and private IP addresses, keep these four ideas in mind:
Private IP addresses are untracked and unrestricted. cannot geographically locate a user’s computer by their private IP address.
It is perfectly normal to see traffic from these numbers if you have a small home or office network. By default, most routers and access points use these numbers to assign to your local computers. It is most likely these numbers represent computers on your own internal network.
If you see these numbers in the headers of an unsolicited email, they usually indicate transit between servers within a corporate network or ISP. Again, they are not useful in identifying the origin of an email. In such cases, you can usually find the true origin by looking for the earliest “Received” mail header.
The traffic does not come from the IANA (the Internet Assigned Numbers Authority), a non-government, Internet-specific organization that gives out (assigns and allocates) IP addresses. As the authority for IP addresses, they do not use or operate them, and they are not the source of the traffic.
Related Articles
What is the difference between LAN and WAN IP Addresses?
What is Network Address Translation?
What is a Firewall?
What is a Link-Local Address?
IPv4 Private Address Space and Filtering – ARIN
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. 0/8 IP addresses: 10. 0 – 10. 255. 255
172. 16. 0/12 IP addresses: 172. 0 – 172. 31. 255
192. 168. 0/16 IP addresses: 192. 0 – 192. 255
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 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. 0/12 range.
Difference between Private and Public IP addresses – GeeksforGeeks
Private IP address of a system is the IP address which is used to communicate within the same network. Using private IP data or information can be sent or received within the same IP address of a system is the IP address which is used to communicate outside the network. Public IP address is basically assigned by the ISP (Internet Service Provider). Attention reader! Don’t stop learning now. Practice GATE exam well before the actual exam with the subject-wise and overall quizzes available in GATE Test Series all GATE CS concepts with Free Live Classes on our youtube channel. Difference between Private and Public IP address:PRIVATE IP ADDRESSPUBLIC IP ADDRESSScope is is is used to communicate within the is used to communicate outside the ivate IP addresses of the systems connected in a network differ in a uniform IP may differ in uniform or non-uniform works only in is used to get internet is used to load network operating is controlled by is available in free of is not free of ivate IP can be known by entering “ipconfig” on command IP can be known by searching “what is my ip” on – 10. 255. 255,
172. 16. 0. 0 – 172. 31. 255,
192. 168. 0 – 192. 255 Range:Besides private IP addresses, rest are public. Example: 192. 1. 10Example: 17. 5. 7. 8
Frequently Asked Questions about private ips
What are three private IPS?
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.Feb 25, 2021
Is 172 a private IP address?
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 192.168 private or public?
Difference between Private and Public IP address:PRIVATE IP ADDRESSPUBLIC IP ADDRESSRange: 10.0.0.0 – 10.255.255.255, 172.16.0.0 – 172.31.255.255, 192.168.0.0 – 192.168.255.255Range: Besides private IP addresses, rest are public.Example: 192.168.1.10Example: 17.5.7.88 more rows•Jul 30, 2019
