- LOC record
In the
Domain Name System , a LOC record (RFC 1876) is a means for expressing geographic location information for a domain name.It contains
WGS84 Latitude ,Longitude andAltitude information together with host/subnet 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 [m1 [s1] {"N"|"S"} d2 [m2 [s2] {"E"|"W"} 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: [0 .. 180] (degrees longitude) m1, m2: [0 .. 59] (minutes latitude/longitude) s1, s2: [0 .. 59.999] (seconds latitude/longitude) alt: [-100000.00 .. 42849672.95] BY .01 (altitude in meters) siz, hp, vp: [0 .. 90000000.00] (size/precision in meters) An example DNS LOC resource record
* yahoo.com in wiki coordinates: coord|37|23.5150|N|121|59.3167|W|region:US-CA_type:landmark|name=Yahoo.com LOC record
* LOC record yahoo.com. IN LOC 37 23 30.900 N 121 59 19.000 W 7.00m 100.00m 100.00m 2.00mAltitude 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.See also
*
List of DNS record types
*Geo (microformat) References
* [http://www.simpledns.com/lookup-loc.aspx Lookup GPS coordinates in DNS] - LOC lookup
* [http://www.nabber.org/projects/geotrace/ GeoTrace] - Map a hostname or domain with a DNS LOC record
* [http://tinydns.org/dns-loc.html DNS-LOC calculator for djbdns's tinydns]
* The wikipedia location resource.
* [http://www.ckdhr.com/dns-loc/sites.html Sites supporting DNS LOC]
* RFC 1876 - How latitude and longitude are stored in a DNS record.
* RFC 2426 Chapter 3.4.2: Text/directory MIME type GEO
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