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A label that conforms to the hostname format defined in Request for Comments (RFC) 952, as modified by RFC 1123. LDH labels can consist of ASCII letters, digits, or hyphens. A hyphen must not occupy the first or last position of the label.
Also Known As
Letter, Digit, Hyphen
LDH
LDH rule
Origin
An acronym that describes the pool of ASCII characters from which labels can be composed. This pool includes: <ul><li>Letters A to Z from the English alphabet (no distinction is made between uppercase and lowercase letters)</li> <li>Digits 0 to 9</li> <li>Hyphens</li></ul>
