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Topic: Address space

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In the News (Sun 26 May 19)

  address space - a Whatis.com definition
Address space is the amount of memory allocated for all possible addresses for a computational entity, such as a device, a file, a server, or a networked computer.
Address space may refer to a range of either physical or virtual addresses accessible to a processor or reserved for a process.
Address space may be differentiated as either flat, in which addresses are expressed as incrementally increasing integers starting at zero, or segmented, in which addresses are expressed as separate segments augmented by offsets (values added to produce secondary addresses).
whatis.techtarget.com /gDefinition/0,294236,sid44_gci773197,00.html   (290 words)

 [No title]
Addresses within this private address space will only be unique within the enterprise, or the set of enterprises which choose to cooperate over this space so they may communicate with each other in their own private internet.
In order to use private address space, an enterprise needs to determine which hosts do not need to have network layer connectivity outside the enterprise in the foreseeable future and thus could be classified as private.
If an enterprise uses the private address space, or a mix of private and public address spaces, then DNS clients outside of the enterprise should not see addresses in the private address space used by the enterprise, since these addresses would be ambiguous.
www.ietf.org /rfc/rfc1918.txt   (2569 words)

 IPv4 Address Report   (Site not responding. Last check: 2007-10-08)
Originally the address block is a parameter set of the underlying protocol, and the intended purpose of segments of the address space is described in an address architecture.
Address space is allocated to the RIRs in units of /8 address blocks, and the specific address blocks allocated to the RIR is an IANA decision.
Addresses are made available from the unallocated pool to meet demands for their use in networks, and are intended to be assigned for as long as the need condition continues.
bgp.potaroo.net /ipv4   (5009 words)

 EOR: Address Space
Address spaces are the mechanism of data organization and access in the EROS system.
An address space key that names a red address space with a keeper is callable unless the don't call attribute of the address space key is set.
Invocations on a callable address space key are reflected to the associated keeper.
www.eros-os.org /devel/ObRef/primary/AddressSpace.html   (1426 words)

 Address space - Wikipedia, the free encyclopedia
In computing, an address space defines a range of discrete addresses, each of which may correspond to a physical or virtual memory register, a network host, peripheral device, disk sector or other logical or physical entity.
In general, things in one address space are physically in a different location than things in another address space.
For example, virtual-to-physical address translation is necessary to translate addresses in the virtual memory address space to addresses in physical address space -- one physical address, and one or more numerically different virtual addresses, all refer to the same physical byte of RAM.
en.wikipedia.org /wiki/Address_space   (455 words)

 NetDB: Address Space Concept - Help
One or many address spaces may be grouped into a Network record which corresponds with an actual network.
The first address in an address space is the network address and cannot be used as a host address.
The last address in an address space is the broadcast address and cannot be used as a host address.
www.stanford.edu /group/networking/netdb/test/help/html/hlpas.html   (459 words)

 CapROS: Address Spaces
Address spaces are constructed as a tree of nodes whose leaves are
If Because address space and node capabilities encode the size of their subspace, the algorithm for traversing the address space tree is slightly more complicated than the comparable hardware mechanism on most processors.
In traversing an address space, a sequence of keys is examined in turn.
www.capros.org /devel/ObRef/concepts/AddressSpaces.html   (1490 words)

 CAIDA : analysis : learn : ipv4space
The old class C address space is by far the most densely covered region of the image.
Similar vertical features are also quite distinct in the old class B address space: many class B networks have more host addresses allocated toward the beginning of their address block rather than toward the end.
The old class A address space is by far the most sparsely covered, which may indicate that these large network blocks are primarily used for internal communication, as opposed to connectivity to the Internet as a whole.
www.caida.org /analysis/learn/ipv4space   (1266 words)

 IPv6 Address Allocation and Assignment Policy
IPv6 address space is a public resource that must be managed in a prudent manner with regards to the long-term interests of the internet.
When an organization has achieved an acceptable utilization for its allocated address space, it is immediately eligible to obtain an additional allocation that results in a doubling of the address space allocated to it.
The /32 address block will contain the already allocated smaller address block (one or multiple /35 address blocks in many cases) that was already reserved by the RIR for a subsequent allocation to the organization.
www.apnic.net /docs/policy/ipv6-address-policy.html   (3649 words)

 Address space layout randomization - Wikipedia, the free encyclopedia
Address space layout randomization (ASLR) is a computer security technique which involves arranging the positions of key data areas, usually including the base of the executable and position of libraries, heap, and stack, randomly in a process' address space.
In both cases, the related memory addresses are obscured from the attackers; these values have to be guessed, and a mistaken guess is not usually recoverable due to the application crashing.
Address space layout randomization relies on the low chance of an attacker guessing where randomly placed areas are located; security is increased by increasing the search space.
en.wikipedia.org /wiki/Address_space_layout_randomization   (1228 words)

 Appendix A: Subnetting an IP Address Space
Only the address space for two of 512 areas is shown in Table A-1.
By keeping these nine bits the same for all addresses in a given area, route summarization is easily achieved at area border routers, as illustrated by the scheme used in Table A-1 Step 3 Step 3.
This method of assigning addresses for the VLSM portion of the address space guarantees that there is no address overlap.
www.cisco.com /univercd/cc/td/doc/cisintwk/idg4/nd20a.htm   (875 words)

 Policies for IPv4 address space management in the Asia Pacific region
In this hierarchy, IANA allocates address space to APNIC, to be redistributed throughout the Asia Pacific region.
The use of private address space may be appropriate for addressing networks that are connected to the Internet via a firewall, and where there are not technical requirements for the use of public address space.
It is a condition of all allocations, that the allocated address space is aggregated by the LIR within a minimum number of route announcements (preferably one).
www.apnic.net /docs/policy/add-manage-policy.html   (4799 words)

 [No title]
[1] The "unspecified address", the "loopback address", and the IPv6 Addresses with Embedded IPv4 Addresses are assigned out of the 0000::/8 address block.
[RFC3513] IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3.
[5] 0000::/96 was previously defined as the "IPv4-compatible IPv6 address" prefix.
www.iana.org /assignments/ipv6-address-space   (253 words)

 The Address Space   (Site not responding. Last check: 2007-10-08)
The address space assigns a number to each of its slots and this number is called the address of the slot.
It is customary to refer to the address of a byte rather than the address of a slot but this leads to much confusion.
As a program runs its evolving state resides largely in an address space that the program lives in and owns.
www.cap-lore.com /Software/LL/AddressSpace.html   (620 words)

 Tech Tip: Windows Memory Allocation Limitations
The address space has a specific range of values and it is the limits of this range that restricts the amount of memory available to the executing process.
The range of an address space is defined by the native word size of the operating system.
The amount of address space is utilized by the system is dependent on the version of Windows NT being used.
www.rivix.com /tech_tip16.htm   (1425 words)

 64-bit Address Space Layout   (Site not responding. Last check: 2007-10-08)
Due to these quadrant content changes, any dependencies on expected addresses for text, data, or shared objects are broken once an application is recompiled from a 32-bit executable to a 64-bit executable.
Because addresses are in different locations for 64-bit applications, 32-bit applications that use fixed addresses cannot simply be recompiled and expected to work.
The 64-bit address space layout is available only on PA2.0 hardware with the supported 64-bit system build environment.
docs.hp.com /en/B3782-90716/ch04s01.html   (866 words)

 LWN: Reorganizing the address space
The traditional organization of the virtual address space (as seen from user space, on x86 systems) is as shown in the diagram to the right.
As a result, the bulk of the address space is preserved in a single, contiguous chunk which can be allocated to either the heap or mmap, as the application requires.
Changing the address space layout rules also affects those applications that specify where in the address space their mmaps are to be placed.
lwn.net /Articles/91829   (1816 words)

 Address Space Objects
The address space state is stored as a root object and a collection of per-page virtual-to-physical memory mappings.
An address space object is loaded by its application kernel with minimal state (currently, just the lock bit), returning a Cache Kernel identifier for the address space object.
Its own data structures for the process record the Cache Kernel identifiers for the address space and thread objects as well as management information associated with the process, such as the bindings of virtual addresses to the program's code and data, which are typically contained in a file.
www-dsg.stanford.edu /papers/cachekernel/subsection3_3_1.html   (920 words)

 INFO: Overview of the Windows 95 Virtual Address Space Layout
To accomplish this, the virtual memory manager uses a virtual address space layout that is considerably different from that used by Microsoft Windows version 3.x and that is slightly different from that used by Microsoft Windows NT.
This four-GB address space is partitioned by the memory manager into four major sections, known as arenas, that are used for different types of applications and parts of the system.
The minimum load address for a Win32 process in Windows 95 is four MB because the first four megabytes are reserved for the Compatibility Arena.
support.microsoft.com /support/kb/articles/Q125/6/91.asp   (985 words)

 Cracking Down on Cyberspace Land Grabs
Los Angeles County had been hit by a growing type of hi-tech fraud, in which large, and usually dormant, segments of the Internet's address space are taken away from their registered users through an elaborate shell game of forged letters, ephemeral domain names and anonymous corporate fronts.
The most rapacious consumers of the stolen address space are spammers trying to stay a step ahead of anti-spam fllists.
Some anti-spam investigators believe an underground economy exists in which a large block of address space is broken down and re-sold in smaller chunks like a boosted Acura in a chop-shop.
www.securityfocus.com /news/5654   (1698 words)

 Researchers Probe Dark and Murky Net
For a variety of reasons ranging from contract disputes among network operators to simple router misconfiguration, over five percent of the Internet's routable address space lacks global connectivity, according to the results of a three-year study by researchers at Massachusetts-based Arbor Networks, to be released Tuesday.
Anecdotal evidence has long hinted at the existence of dark address space, but the researchers shed light on the subject by continuously gathering and analyzing core routing tables for three years.
Blocks of Internet address space that are supposed to be unused sometimes briefly appear in global routing tables, and are used to launch a cyber attack, or to send a flurry of unsolicited commercial email, before being withdrawn without a trace.
www.securityfocus.com /news/282   (655 words)

 The Old New Thing : Why is the virtual address space 4GB anyway?
The size of the address space is capped by the number of unique pointer values.
The real limitation on the address space using the selector:offset model is that each selector merely describes a subset of a flat 32-bit address space.
Current 64-bit processors do support a 63- or 64-bit virtual address space (they don't have enough address lines, of course, because the physical RAM to realize such a space would be vast).
blogs.msdn.com /oldnewthing/archive/2004/08/17/215682.aspx   (5930 words)

 How To Map Adapter RAM into Process Address Space   (Site not responding. Last check: 2007-10-08)
Of this, the upper 2 GB address ranging from 0x8000000 to 0xFFFFFFFF is common to all processes running in the system, and it is called kernel or system address space.
A maximum of 50,000 PTEs (approximately 195 MB address space) are reserved for general use.
This means that your driver might not be able to get enough contiguous virtual address space from the system PTE pool at any given time, even though the total address space still remaining in it might be large enough.
support.microsoft.com /default.aspx?scid=kb;EN-US;Q189327   (1212 words)

 [No title]
INTERNET PROTOCOL V4 ADDRESS SPACE (last updated 2006-10-03) The allocation of Internet Protocol version 4 (IPv4) address space to various registries is listed here.
Originally, all the IPv4 address spaces was managed directly by the IANA.
Later parts of the address space were allocated to various other registries to manage for particular purposes or regional areas of the world.
www.iana.org /assignments/ipv4-address-space   (99 words)

 User-Level Memory Management in Linux Programming > Linux/Unix Address Space   (Site not responding. Last check: 2007-10-08)
Although it is possible to give memory back to the system and shrink a process's address space, this is almost never done.
This is particularly true on modern systems, on which process address spaces are large and the gap between the top of the stack and the end of the heap is a big one.
Most of that space is occupied by the symbols, a list of the program's variables and function names.
www.informit.com /articles/article.asp?p=173438   (1182 words)

 BGP-system usage of 32 bit Internet address space
E.g., an address of with a mask of 24 bits means that starting at IP address for 32-24=8 bits, or 256 individual IP addresses, are allocated for the specific routing entry.
If we use the square root of the maximum number of clusters (i.e., sqrt((2^32)/256)), we see that the global address space can be visualized by means of a 4096*4096 matrix, with each matrix entry representing exactly one of those clusters.
CIDR has helped somewhat with amorphously allocated address space, but stopped short of needed renumbering to create larger clusters and reduce the routing table sizes.
moat.nlanr.net /IPaddrocc   (704 words)

 IPv6 Address Space
As defined in [RFC2373] the specific type of an IPv6 address is indicated by the leading bits in the address.
IPv6 Unicast addresses are distinguished from multicast addresses by the value of the high-order octet of the addresses: a value of 0xFF (binary 11111111) identifies an address as a multicast address; any other value identifies an address as a unicast address.
Anycast addresses are taken from the unicast address space, and are not syntactically distinguishable from unicast addresses.
michael.gargantuan.com /ipv6_address_space.htm   (329 words)

 LWN: Address space randomization in 2.6   (Site not responding. Last check: 2007-10-08)
Arjan van de Ven has posted a series of patches which add some address space randomization to the 2.6 kernel.
This might not crash the program in certain cases; but if you randomize the address space, then those certain cases will certainly crash the program in one run or another.
With randomization, most attempts to work out the address space on the remote machine cause Apache to crash; a good admin notices his servers crashing, and investigates why.
lwn.net /Articles/121845   (1818 words)

 The address book desk / timo arnall
This space has potential be used for context information; a corner of the table could make my phone silent, another corner could change my presence online.
I’m thinking about other objects and spaces that might be appropriate for this, and perhaps around the idea of thoughtless acts.
If this was a space without wireless internet, I could also imagine this working very well for URLs: quick access to google searches, local services or number lookups, which is usually very tricky on a small screen.
www.elasticspace.com /2005/12/address-book-desk   (1388 words)

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