"DDNS" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "DDNS (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "dynamic Domain Name System"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Internet",
          "orig": "en:Internet",
          "parents": [
            "Computing",
            "Networking",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of dynamic Domain Name System."
      ],
      "id": "en-DDNS-en-noun-DT7VnBYv",
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "dynamic Domain Name System",
          "w:dynamic DNS"
        ]
      ],
      "raw_glosses": [
        "(Internet) Initialism of dynamic Domain Name System."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of",
        "initialism",
        "uncountable"
      ]
    }
  ],
  "word": "DDNS"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "DDNS (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "dynamic Domain Name System"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English nouns",
        "English uncountable nouns",
        "English words without vowels",
        "en:Internet"
      ],
      "glosses": [
        "Initialism of dynamic Domain Name System."
      ],
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "dynamic Domain Name System",
          "w:dynamic DNS"
        ]
      ],
      "raw_glosses": [
        "(Internet) Initialism of dynamic Domain Name System."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of",
        "initialism",
        "uncountable"
      ]
    }
  ],
  "word": "DDNS"
}