Technically invalid IP address
The Internet Protocol Version 4 address can have multiple uses.
Uses.
Official meaning and use.
IANA, who allocate IP addresses globally, have allocated the single IP address to section 3.2.1.3. It is named as "This host on this network".
RFC 1122 refers to using the notation {0,0}. It prohibits this as a destination address in IPv4 and only allows it as a source address under specific circumstances.
A host may use as its own source address in IP when it has not yet been assigned an address, such as when sending the initial "DHCPDISCOVER" packet when using DHCP.
Operating system specific uses.
Some operating systems have attributed special internal meanings to the address. These uses do not result in IPv4 packets containing and so are not governed by RFC 1122. These meanings may not be consistent between operating systems.
In both Windows and Linux, when selecting which of a host's IP address to use as a source IP, a program may specify INADDR_ANY ().
In Linux a program may specify as the remote address to connect to the current host (AKA localhost).
Other non-standard uses.
Besides the use by operating systems internally, other uses have been attributed to the address. 
Routing.
In routing tables, can also appear in the gateway column. This indicates that the gateway to reach the corresponding destination subnet is unspecified. This generally means that no intermediate routing hops are necessary because the system is directly connected to the destination.
The CIDR notation defines an IP block containing all possible IP addresses. It is commonly used in routing to depict the default route as a destination subnet. It matches all addresses in the IPv4 address space and is present on most hosts, directed towards a local router.
In IPv6.
In IPv6, the all-zeros address is typically represented by (two colons), which is the short notation of . The IPv6 variant serves the same purpose as its IPv4 counterpart.
0.0.0.0 day exploit.
In August 2024, researchers from Israeli cybersecurity firm Oligo announced that a security flaw had been discovered in which malicious requests to the address of their target, allowing them to access private resources, such as developer code or internal messages.
References.
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