In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, a memory cell or other logical or physical entity.
For software programs to save and retrieve stored data, each datum must have an address where it can be located. The number of address spaces available depends on the underlying address structure, which is usually limited by the computer architecture being used. Often an address space in a system with virtual memory corresponds to a highest level translation table, e.g., a segment table in IBM System/370.
Address spaces are created by combining enough uniquely identified qualifiers to make an address unambiguous within the address space. For a person's physical address, the address space would be a combination of locations, such as a neighborhood, town, city, or country. Some elements of a data address space may be the same, but if any element in the address is different, addresses in said space will reference different entities. For example, there could be multiple buildings at the same address of "32 Main Street" but in different towns, demonstrating that different towns have different, although similarly arranged, street address spaces.
An address space usually provides (or allows) a partitioning to several regions according to the mathematical structure it has. In the case of total order, as for memory addresses, these are simply chunks. Like the hierarchical design of postal addresses, some nested domain hierarchies appear as a directed ordered tree, such as with the Domain Name System or a directory structure. In the Internet, the Internet Assigned Numbers Authority (IANA) allocates ranges of IP addresses to various registries so each can manage their parts of the global Internet address space.[1]
^"IPv4 Address Space Registry". Internet Assigned Numbers Authority (IANA). Archived from the original on April 30, 2010. Retrieved September 1, 2011.
In computing, an addressspace defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector,...
32-bit value, IPv6 addresses have a size of 128 bits. Therefore, in comparison, IPv6 has a vastly enlarged addressspace. IPv6 addresses are classified by...
Addressspace layout randomization (ASLR) is a computer security technique involved in preventing exploitation of memory corruption vulnerabilities. In...
In computing, a virtual addressspace (VAS) or addressspace is the set of ranges of virtual addresses that an operating system makes available to a process...
1990s, it became evident that far more addresses would be needed to connect devices than the IPv4 addressspace had available. By 1998, the IETF had formalized...
equivalent to the historically used subnet mask 255.255.255.0. The IP addressspace is managed globally by the Internet Assigned Numbers Authority (IANA)...
(IPv6), its successor. IPv4 uses a 32-bit addressspace which provides 4,294,967,296 (232) unique addresses, but large blocks are reserved for special...
remaining IPv4 addresses, a /10 size IPv4 address block was assigned by Internet Assigned Numbers Authority (IANA) to be used as shared addressspace. This block...
296) locations, or a 4 GiB addressspace. In contrast, a 36-bit word-addressable machine with an 18-bit address bus addresses only 218 (262,144) 36-bit...
same MAC address. The IEEE 802 MAC address originally comes from the Xerox Network Systems Ethernet addressing scheme. This 48-bit addressspace contains...
successor protocol, IPv6. IPv4 and IPv6 coexist on the Internet. The IP addressspace is managed globally by the Internet Assigned Numbers Authority (IANA)...
Network address translation (NAT) is a method of mapping an IP addressspace into another by modifying network address information in the IP header of...
appears as a contiguous addressspace or collection of contiguous segments. The operating system manages virtual addressspaces and the assignment of real...
private network is a computer network that uses a private addressspace of IP addresses. These addresses are commonly used for local area networks (LANs) in...
system usually uses virtual memory to provide separate addressspaces called user space and kernel space. Primarily, this separation serves to provide memory...
with a particular addressspace; they implicitly refer to the current addressspace. Hence, every time there is a change in addressspace, such as a context...
for two addressspaces, referred to as primary addressspace (CR1) and secondary addressspace (CR7), and to move data between the addressspaces subject...
scenario. In the address allocation architecture of the Internet using CIDR and in large organizations, efficient allocation of addressspace is necessary...
The sideways addressspace on the Acorn BBC Microcomputer, Electron and Master-series microcomputer was Acorn's bank switching implementation, providing...
multicast addressspace provided to each organization that has /24 or larger globally routed unicast addressspace allocated; one multicast address is reserved...
single addressspace operating system can be faster than switching between two processes in an operating system with private per-process addressspaces. Context...
have a limited number of address bus bits, limited by the processor package or design of the system. Some of the addressspace may be shared between RAM...
science, a single addressspace operating system (or SASOS) is an operating system that provides only one globally shared addressspace for all processes...
on arbitrary pages anywhere in RAM as a seemingly contiguous logical addressspace. These pages became the units exchanged between disk and RAM. When a...
memory-mapped and I/O port spaces, each device function on the bus has a configuration space, which is 256 bytes long, addressable by knowing the eight-bit...
addressspace (PGAS) is a parallel programming model paradigm. PGAS is typified by communication operations involving a global memory addressspace abstraction...
Global Information