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.

When the DNS resolver gets a PTR ( reverse-lookup ) request, it begins by querying the root servers ( which point to The American Registry For Internet Numbers ' ( ARIN's ) servers for the < tt > 208. in-addr. arpa </ tt > zone ).

When an application makes a request that requires a domain name lookup, such programs send a resolution request to the DNS resolver in the local operating system, which in turn handles the communications required.

When DNS was first introduced, the database was small and could be easily maintained by hand.

When DNSSEC is used, each answer to a DNS lookup will contain an RRSIG DNS record, in addition to the record type that was requested.

When IP-based virtual hosting is used, each site ( either a DNS host name or a group of DNS host names that act the same ) points to a unique IP address.

When a client requests a website, DNS is queried by the browser.

When presented with a hostname without any context, it is usually safe to assume that the network is the Internet and the hostname's naming system is the DNS.

When an ISP allocates a range to a customer, it usually also delegates the management of that space to the customer by insertion of name server resource records ( pointing to the customers DNS facilities ) into their zone.

When a request to deliver an email arrives, the claimed sender's domain name is sent in a query to a high-level DNS server.

When a spammer tries to send an email claiming to be from amazon. com, for example, the receiver queries the. com DNS server, then a server in a secure building at Amazon.

When a DNS server has received such non-authentic data and caches it for performance optimization, it is considered poisoned, supplying the non-authentic data to the clients of the server.

When viewed over the Web, all tel domains point directly to a Telnic proxy webpage that is populated on the fly presenting the respective domain name owner's contact data stored within the DNS system.

When you register / purchase your domain name on a particular " registrars name server ", your DNS settings are kept on their server, and in most cases point your domain to the Name Server of your hosting provider.

Consider the IP number something similar to a phone number: When someone calls http :// www. mydomain. com, your ISP looks at the DNS server, and asks " how do I contact http :// www. mydomain. com '?

When you register / purchase your domain name on a particular " registrars name server ", your DNS settings are kept on their server, and in most cases point your domain to the Name Server of your hosting provider.

When a computer on the Internet needs to resolve a domain name, it uses resolver software to perform the lookup.

When an A record lookup for < tt > foo. example. com </ tt > is done, the resolver will see a CNAME record and restart the checking at < tt > bar. example. com </ tt > and will then return 192. 0. 2. 23.

When used with electronic driver amplifiers and feedback windings tightly coupled to the input windings, their accuracy is enhanced, and they can be cascaded (" resolver chains ") to compute functions with several terms, perhaps of several angles, such as gun ( position ) orders corrected for ship's roll and pitch.

When the historian encounters a situation in which he can perceive no visible cause and effect sequence, he should be alert to intuition and unconscious instinct as possible guides.

When Beavis eats all of Tom Anderson's candy, his Cornholio persona emerges and embarks on a rampage to acquire more from other trick-or-treaters, while Butt-Head is taken on a " ride " to the countryside in Todd's trunk, where he encounters a strangely pale old farmer.

When the traversal encounters an atom through which the current path has already passed, a ghost atom is generated in order to keep the tree finite.

When he first encounters the Fourth Doctor in Genesis of the Daleks, Davros is the chief scientist of the Kaleds, one of two native sentient races of the planet Skaro.

When Fortinbras arrives to greet King Claudius, he encounters the deadly scene: Gertrude, Claudius, Laertes, and Hamlet are all dead.

When studying inorganic compounds, one often encounters parts of the different classes of inorganic chemistry ( an organometallic compound is characterized by its coordination chemistry, and may show interesting solid state properties ).

When the browser encounters references to content a plug-in specializes in, the data is handed off to be processed by that plug-in.

When the immune system of a vertebrate encounters a virus, it may produce specific antibodies which bind to the virus and neutralize its infectivity or mark it for destruction.

When light encounters a boundary between two media with different refractive indices, some of it is usually reflected as shown in the figure above.

When it encounters the high mountains that separate Greece from the Republic of Macedonia, it descends the other side, gathering a tremendous momentum and bringing cold conditions to the city of Thessaloniki and the Axios delta.

When the animal encounters a new scent, it will lick and bite the source, then form a scented froth in its mouth and paste it on its spines with its tongue.

When this light encounters a pigment, parts of the spectrum are absorbed by the chemical bonds of conjugated systems and other components of the pigment.

When Nell enters the castle of King Coyote in the Primer's final challenge for her, she encounters an enormous computer apparently designed to think and placed in charge of the kingdom.

( In order not to interpret +++ which may be a part of data as the escape sequence the sender stops communication for one second before and after the +++). When the modem encounters this in a stream of data, it switches from its normal mode of operation which simply sends any characters to the phone, to a command mode in which the following data is assumed to be a part of the command language.

When a moth encounters a much closer artificial light and uses it for navigation, the angle changes noticeably after only a short distance, in addition to being often below the horizon.

When a caesium atom within the chamber encounters a photon from the lamp, it is excited to a higher energy state, emits a photon and falls to an indeterminate lower energy state.

When Buffy encounters Oz, he is the leader of a pack of werewolves who can completely control their wolf forms ; Oz assists in the final battle of the book, set during a full moon.

* When one encounters another repeatedly in various locations such that it seems to be more than coincidence, one can refer to yuánfèn.

When he goes upstairs, after noticing some firelight there, he encounters the woman, who is stealing hair from the dead bodies on the second floor.

When the party encounters monsters the view switches perspective and players are presented with several options on a menu ; these first-person menu-based battles have become a staple of the series.

When a T < sub > h </ sub > cell encounters and recognises the antigen, on an APC, the TCR-CD3 complex binds strongly to the peptide-MHC complex present on the surface of professional APCs.

When the reader finally encounters the unknown woman, it transpires that the couple are being paid to have sex in front of upper-class clientele.

When Red Dwarf encounters a Holoship, with an all-hologram crew composed of the " best and brightest ", Rimmer desperately wants to join.

When the person again encounters the allergen, these basophils and mast cells that have bound to IgE release histamine, prostaglandins and leukotrienes, which causes inflammation of the surrounding tissues, resulting in allergic symptoms.

When this thread encounters a high latency event ( L2 cache miss, etc.