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127.0.0.1 is the IPv4 loopback address: it lets a computer send IP traffic to itself. The reserved loopback range is broader—127.0.0.0/8—but 127.0.0.1 is the address most commonly used. A successful loopback test shows that local IP communication works; it does not prove that your network connection or the public internet is reachable.
What does 127.0.0.1 mean?
When a program connects to 127.0.0.1, it is addressing the same computer on which it is running, rather than another device on the local network or a server on the internet. This is called loopback: the traffic stays within the host for programs on that computer to communicate using IP.
IANA describes the address range as a way for a computer to identify itself to itself. RFC 3330 likewise says a datagram sent to an address in the block should loop back inside the host. [IANA; RFC 3330]
Why is the whole 127.0.0.0/8 range reserved?
The slash notation /8 identifies a block of IPv4 addresses, not a single address. IANA’s IPv4 Special-Purpose Address Space registry lists 127.0.0.0/8 as Loopback and references RFC 1122 section 3.2.1.3. The registry was last updated on October 9, 2025. The allocation date shown in the registry is September 1981; that is the block’s recorded allocation date, not the release date of a particular software implementation. [IANA IPv4 Special-Purpose Address Space; RFC 6890]
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Although the block includes many addresses, RFC 3330 notes that typical implementations use 127.0.0.1/32, and IANA says other addresses in the range are seldom used. The entire block is reserved for loopback; that does not mean every address within it is routinely assigned to an application.
Is 127.0.0.1 my IP address?
It is an IP address your computer can use to refer to itself, but it is not the address that identifies your computer to other devices across the internet. IANA’s registry marks the loopback range as not forwardable and not globally reachable. It also marks it as neither a valid source nor destination for ordinary network traffic. [IANA IPv4 Special-Purpose Address Space]
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That makes 127.0.0.1 different from a private-use address such as one in 192.168.0.0/16. A private-use address can identify a device within a local network; loopback refers back to the current host. RFC 6761 treats localhost as a special-use name associated with loopback, but details of name resolution can depend on the operating system and its configuration. [RFC 6761]
What does a successful loopback test prove?
A successful connection to 127.0.0.1 is evidence that the host can communicate with itself over IP, and may confirm that a local service is responding at that address and port. Because loopback traffic does not need to travel to another device, the result alone does not establish that your network interface, router, internet provider, or a remote website is reachable. This distinction follows from the address’s host-local purpose and its registry restrictions.
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Use a loopback check to investigate local IP communication. To check a connection beyond the computer, test the relevant next step separately—for example, a service on another device or a remote destination. A local success and an external failure point to different parts of the connection path, so one test cannot substitute for the other.
What does “localhost” mean?
localhost is a special-use name associated with loopback, commonly used in place of the numeric address. RFC 6761 defines special handling for localhost names. The exact resolver behavior and configuration should not be assumed to be identical on every operating system. [RFC 6761]
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In practical use, an application or browser pointed at localhost is intended to reach a service on the same computer—not a public server. If the expected local service does not respond, the loopback address by itself does not reveal whether the service is running or configured to accept the connection.
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Can 127.0.0.1 be accessed from the internet?
It is not intended to be reachable as a public internet destination. The IANA registry marks the full 127.0.0.0/8 range as not globally reachable and not forwardable. Loopback traffic is meant to remain on the host, rather than be routed between computers. [IANA IPv4 Special-Purpose Address Space]
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RFC 6890 notes that special-purpose address registry entries can have protocol exceptions, so the registry should not be read as a claim that no protocol could ever define an exception. For ordinary networking, however, 127.0.0.1 means “this host,” not “a server somewhere on the internet.” [RFC 6890]
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