# Web working [TOC] # DNS Detail ## Domain Hierarchy ### Top-Level Domain  - GTLD - CCTLD ### Second-level Domain  ### Sub domain  #### limit  ## Records type ### A Record  ### AAAA Record  ### CNAME Record  - bolg.meowhecker.com -> meowhecker.com - shop.meowhecker.com -> meowhecker.com - fish.meowhecker.com -> meowhecker.com Nslookup  ### MX Record Query SMTP server IP  Nslookup  ### TxT Record  Nslookup  ## DNS request  # HTTP ## Request/Response ### URL  ### Maker Request   ### Response  ## HTTP Method  ## HTTP status code ### Information response 0~199  ### Success 200~299  ### Redirection 300~399  ### Client Error 400~499  ### Server Error 500~599  # Website working  ## Load Balances  ## CDN  ## WAF  ## Web server working ### Web server  ### Virtual host 
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