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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsIP stands for Internet Protocol. An IP address is a network-layer address that helps direct data packets to a network interface across interconnected networks. It is used for delivery—not as a guaranteed identity for a person, a domain name, or a route.
What does an IP address do?
When a device sends data across a network, the Internet Protocol carries it in units called datagrams, commonly referred to as packets. The packet includes source and destination IP addresses. Network components use the destination address to direct the packet toward its intended endpoint.
The Internet Engineering Task Force (IETF) describes the protocol this way: “The internet protocol provides for transmitting blocks of data called datagrams from sources to destinations, where sources and destinations are hosts identified by fixed length addresses.” That description appears in RFC 791: Internet Protocol, published in September 1981.
How is an IP address different from a name or a route?
These terms describe different parts of communication. RFC 791 distinguishes them as follows:
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- Name: what is being sought.
- Address: where it is.
- Route: how to get there.
An IP address is therefore a delivery address used by the network, not the same thing as a website’s human-readable domain name or the path packets take through networks.
What are IPv4 and IPv6?
IPv4 and IPv6 are two versions of the Internet Protocol. Their main difference for addressing is the size of the address:
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| Version | Address width | Role |
|---|---|---|
| IPv4 | 32 bits | The earlier version; its familiar addresses are written as four decimal numbers separated by dots. |
| IPv6 | 128 bits | The successor to IPv4, with a much larger address space. |
The IETF specifications define the widths: IPv4 is 32 bits in RFC 791, and IPv6 is 128 bits in RFC 8200: Internet Protocol, Version 6 (IPv6) Specification, published in July 2017. ICANN’s 2011 beginner guide describes IPv4’s space as about 4.3 billion addresses; this is a rounded historical figure, not a current report on address allocation.
Does an IP address identify a person or device?
Not by itself. An IP address is associated with a network interface or, in IPv6, a set of interfaces; it is not a guaranteed identifier for one person or one physical device. The address is used to help deliver network traffic, and the same person or device should not be assumed to have one permanent, uniquely identifying address in every situation.
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What can an IP address reveal about privacy and security?
An IP address may be visible to network endpoints as part of ordinary delivery. The IPv6 specification notes that endpoint visibility can create privacy issues, but that does not mean an address always reveals a person’s identity or precise home location.
IPv6 alone does not make traffic private or secure. RFC 8200 discusses protections such as IPsec and higher-layer protocols such as TLS or SSH for certain attacks, and notes that IPv6 itself has no mechanism to prevent denial-of-service attacks. Protection depends on the relevant protocols and configuration, not simply on whether an address is IPv4 or IPv6.
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