LOC record
DNS resource record holding location data
In the Domain Name System, a LOC record (experimental RFC 1876) is a means for expressing geographic location information for a domain name.
It contains WGS84 Latitude, Longitude and Altitude (ellipsoidal height) information together with host/subnet physical size and location accuracy. This information can be queried by other computers connected to the Internet.
01Record format
The LOC record is expressed in a master file in the following format:
⟨owner⟩ ⟨TTL⟩ ⟨class⟩ 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)02An example DNS LOC resource record
- statdns.net for the coordinates: 52°22′23″N 4°53′32″E / 52.37306°N 4.89222°E / 52.37306; 4.89222 (StatDNS.net LOC record)
03Altitude 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 WGS84 reference ellipsoid).
Sources and credits
This article is adapted from the Wikipedia article “LOC record”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
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