In the

Domain Name System The Domain Name System (DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources on the Internet or other Internet Protocol (IP) networks. It associates various information ...

, a LOC record (experimental ) is a means for expressing geographic location information for a

domain name In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority, or control. Domain names are often used to identify services provided through the Internet, such as websites, email services, and more. ...

. It contains

WGS84 The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS. The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also descri ...

Latitude In geography, latitude is a geographic coordinate system, geographic coordinate that specifies the north-south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from −90° at t ...

Longitude Longitude (, ) is a geographic coordinate that specifies the east- west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek lett ...

and

Altitude Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum (geodesy), datum and a point or object. The exact definition and reference datum varies according to the context (e.g., aviation, geometr ...

(

ellipsoidal height Geodetic coordinates are a type of curvilinear orthogonal coordinate system used in geodesy based on a '' reference ellipsoid''. They include geodetic latitude (north/south) , ''longitude'' (east/west) , and ellipsoidal height (also known as g ...

) information together with host/

subnet A subnet, or subnetwork, is a logical subdivision of an IP network. Updated by RFC 6918. The practice of dividing a network into two or more networks is called subnetting. Computers that belong to the same subnet are addressed with an identica ...

physical size and location accuracy. This information can be queried by other computers connected to the Internet.

Record format

The LOC record is expressed in a master file in the following format: LOC ( d1 1 [s1 d2 [m2 [s2">1.html" ;"title="1 [s1">1 [s1 d2 [m2 [s2 alt["m"">1">1_[s1<_a>__d2_[m2_[s2.html" ;"title="1.html" ;"title="1 [s1">1 [s1 d2 [m2 [s2">1.html" ;"title="1 [s1">1 [s1 d2 [m2 [s2 alt["m"[siz["m"] [hp["m"] [vp["m" ) (The parentheses are used for multi-line data as specified in RFC 1035, section 5.1.) where:

    d1:     [0 .. 90]            (degrees latitude)
    d2:       .. 180          (degrees longitude)
    m1, m2:   .. 59           (minutes latitude/longitude)
    s1, s2:   .. 59.999       (seconds latitude/longitude)
    alt:     100000.00 .. 42849672.95BY .01 (altitude in meters)
    siz, hp, vp:   .. 90000000.00(size/precision in meters)

An example DNS LOC resource record

* statdns.net for the

coordinates In geometry, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine and standardize the Position (geometry), position of the Point (geometry), points or other geometric elements on a manifold such as ...

Altitude for Geosynchronous Earth Satellites

The altitude range provides the following: * DNS altitude range 100000.00 .. 42849672.95 This range can be easily stored in 4 bytes. * Maximum altitude is 42,849.67295 km. Which is large enough to store the altitude of a circular geosynchronous orbit (i.e. approximately 35,790 km above mean sea level). * Maximum depth of 100 km below earth surface (approximated by the

reference ellipsoid An Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences. Various different ellipsoids have been used as approximation ...

References

* Wikipedia:WikiProject Geographical coordinates The Wikipedia location resource.
Sites supporting DNS LOC
* - How latitude and longitude are stored in a DNS record. * Chapter 3.4.2: Text/directory MIME type GEO * Section 6.5.2: GEO (obsoleted , updated by ) {{DEFAULTSORT:Loc Record DNS record types Internet geolocation

Record format

An example DNS LOC resource record

Altitude for Geosynchronous Earth Satellites

See also

References