[{"data":1,"prerenderedAt":41},["ShallowReactive",2],{"$f1tc7ti99tqf4f":3},{"title":4,"seoTitle":5,"description":6,"route":7,"kind":8,"toolKey":9,"intro":10,"indexable":11,"sections":12,"related":38},"CNAME 查詢","CNAME 查詢 | nslookup.online","查詢 CNAME 別名鏈，辨識迴圈與未完成狀態，補查終點 A\u002FAAAA，不將無位址直接判為無效。","\u002Fzh-tw\u002Fcname-lookup\u002F","tool","cname","追蹤網域別名鏈，檢視目標與終點位址。",true,[13,20,26,32],{"id":14,"title":15,"paragraphs":16,"code":19},"read-answer","從準確別名開始",[17,18],"CNAME 將一個 DNS 名稱指向另一名稱。應查實際別名，如 www.example.com，不能假設所有子網域與根網域相同。","DNS 別名不改變瀏覽器網址或路徑，網頁跳轉仍需 HTTP 重新導向。","www.example.com.  300 IN CNAME edge.example.net.\nedge.example.net. 300 IN A     192.0.2.10\n\n文件範例 — 非即時 DNS 回應",{"id":21,"title":22,"paragraphs":23},"endpoint","追蹤別名並檢查終點",[24,25],"逐步追蹤 CNAME，記錄經過名稱並偵測迴圈。終點補查 A\u002FAAAA，仍透過所選遞迴解析器。","十跳是產品保護上限，不是 DNS 協定限制。逾時、迴圈與達到上限時保留證據並標記未完成。",{"id":27,"title":28,"paragraphs":29},"errors","無位址不等於別名錯誤",[30,31],"終點沒有 A\u002FAAAA 不能單獨證明無效，應結合服務需求、其他記錄與提供商說明。NXDOMAIN 則是名稱不存在的回應。","一般 CNAME 通常不可與同名其他資料共存。根網域需有 SOA、NS；ALIAS、ANAME 或 flattening 不一定是公開 CNAME。",{"id":33,"title":34,"paragraphs":35},"questions","排查鏈路差異",[36,37],"先匹配名稱、類型及解析器。別名與位址快取可有不同 TTL，不一定同時更新。","工具不直接連線每個權威伺服器，也不驗證 TLS、HTTP 或應用狀態；請保留原設定並向服務商核對。",[39,40],"\u002Fguides\u002Fa-record-vs-cname\u002F","\u002F",1792661399379]