The purpose of + 1-areacode-555-1313, a pay-per-use " name that number " reverse lookup information service introduced in the mid-1990s, differs from ANAC.

ANAC announces the caller's own number ; the reverse lookup gives the directory name for a listed telephone number input by the user.

For IPv6, the reverse lookup domain is < tt > ip6. arpa </ tt >.

When performing a reverse lookup, the DNS client converts the address into these formats, and then queries the name for a PTR record following the delegation chain as for any DNS query.

* walldns — a " reverse DNS wall ", providing IP to domain name lookup only.

The differences are that a DNSBL lookup uses the " A " rather than " PTR " record type, and uses a forward domain ( such as dnsbl. example. net above ) rather than the special reverse domain in-addr. arpa.

If the *@ host option is used, the server must conduct a reverse DNS lookup on the user and then compare the returned host to the hosts in the G-line list.

If the *@ host option is used, the server must conduct a reverse DNS lookup on the user and then compare the returned host to the hosts in the Z-line list.

After < tt > arpa </ tt > had served its transitional purpose, it proved impractical to remove the domain, because in-addr. arpa was used for reverse DNS lookup of IP addresses.

* < tt > in-addr. arpa </ tt > – reverse DNS lookup for IPv4 addresses

* < tt > ip6. arpa </ tt > – reverse DNS lookup for IPv6 addresses

In computer networking, reverse DNS lookup or reverse DNS resolution ( rDNS ) is the determination of a domain name that is associated with a given IP address using the Domain Name Service ( DNS ) of the Internet.

To provide more human-usable data, these programs often perform a reverse lookup prior to writing the log, thus writing a name rather than the IP address

Another pattern, called dependency lookup, is a regular process and reverse process to dependency injection.

The simplest and by far most widely deployed authentication scheme begins with a reverse DNS lookup of the connecting IP address.

# First a reverse DNS lookup ( PTR query ) is performed on the IP address, which returns a list of zero or more PTR records.

Important anti-spam and email verification techniques such as SenderID and Sender Policy Framework rely on the reverse lookup being correctly set.

Without correct reverse lookup these systems cannot function, so it is very bad practice to have this incorrectly set.

But this is a mandatory requirement, and those cases where ISPs won't set reverse lookup, nor delegate it will, in almost all cases, provide a suitable server for sending email for their clients which does have it set correctly.

To address this issue of scale, reverse lookup tables were generated that only stored a smaller selection of hashes that when reversed could generate long chains of passwords.

Although the reverse lookup of a hash in a chained table takes more computational time, the lookup table itself can be much smaller, so hashes of longer passwords can be stored.

When a multicast packet enters a router's interface, it will lookup the list of networks that are reachable via that input interface i. e., it checks the reverse path of the packet.

After you have taken a breather, reverse the position of your legs so that the front thigh of the previous exercise is now to the rear, and the rear thigh now to the front, and perform the same movement in the same manner.

However one looks at it, therefore, I'd say that your horoscope for this autumn is the reverse of rosy.

Even if we strip their respective claims to the barest minimum, the `` odds '' still favor them both, for the trend in effect is always more likely to continue than to reverse.

The first is that enforcement of national law in state litigation raises in reverse the old diversity puzzle of the relation of procedure to substance.

Presumably, if the reverse is the case and the good effect is more certain than the evil result that may be forthcoming, not only must the good and the evil be prudentially weighed and found proportionate, but also calculation of the probabilities and of the degree of certainty or uncertainty in the good or evil effect must be taken into account.

However, this story may reflect a cultural influence which had the reverse direction: Hittite cuneiform texts mention a Minor Asian god called Appaliunas or Apalunas in connection with the city of Wilusa attested in Hittite inscriptions, which is now generally regarded as being identical with the Greek Ilion by most scholars.

Another set of methods is the aromatization of cyclohexanes and other aliphatic rings: reagents are catalysts used in hydrogenation such as platinum, palladium and nickel ( reverse hydrogenation ), quinones and the elements sulfur and selenium.

The reverse reaction ( in free space, without an atomic nucleus ) is also impossible for this reason.

A reverse example is that of versus in Hindi-Urdu.

Although all molecules that have the property of immunogenicity also have the property of antigenicity, the reverse is not true.

The reverse of the photo is signed by Duke's family and bears this message: " This is the family of Astronaut Duke from Planet Earth.

In addition to over, Porter and Duff defined the compositing operators in, held out by ( usually abbreviated out ), atop, and xor ( and the reverse operators rover, rin, rout, and ratop ) from a consideration of choices in blending the colors of two pixels when their coverage is, conceptually, overlaid orthogonally:

The reverse effect is known as impact ionization.

Note electrode naming for diodes is always based on the direction of the forward current ( that of the arrow, in which the current flows " most easily "), even for types such as Zener diodes or solar cells where the current of interest is the reverse current.

Ancient Nubia shared many aspects of its mythology with ancient Egypt and there is debate about the original source of some religious concepts that the two cultures share and, whether the assimilation was from Nubia to Egypt, the reverse, or through continuing exchanges.

The chief coin type, a griffon, is identical with that of Teos ; the rich silver coinage is noted for the beauty and variety of its reverse types.

The reverse, in which the perimeter is magnified more than the center, is known as " pincushion distortion " ( figure 7b ).

Cistern water is usually chlorinated, though reverse osmosis systems provide even better quality drinking water.

But the reverse is not true.

Decryption is exactly the same as encryption, except that P1, P2 ,..., P18 are used in the reverse order.