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David3141593's profile
Dаvіd Вucһаnаn
Dаvіd Вucһаnаn
Dаvіd Вucһаnаn
@David3141593

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Dаvіd Вucһаnаn

@David3141593

from pwn import *; alias = "Retr0id"

Ring -1
da.vidbuchanan.co.uk
Joined December 2013

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    1. Bruce Potter‏ @gdead 10 Sep 2018
      • Report Tweet
      • Report NetzDG Violation

      Bruce Potter Retweeted Derek Rook

      God. Dammit. This is the second time today I’ve seen www referred to as a subdomain & I’m going to lose my shit. Does it have an A record? Then it’s a hostname. The use of a domain as a hostname (CNAMEing www to an A record for the domain) still gives me hives. #GetOffMyLawnhttps://twitter.com/_r00k_/status/1039271145181081600 …

      Bruce Potter added,

      Derek Rook @_r00k_
      Just had a major slack conversation about how www is just a sub domain, like any other sub domain. The next time you think "Naw, my talk/blog/video doesn't bring anything new to the table" think back on this anecdote.
      Show this thread
      7 replies 9 retweets 75 likes
    2. Dаvіd Вucһаnаn‏ @David3141593 11 Sep 2018
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      Replying to @gdead

      Could you please explain in more detail? I don't understand. If I have "A" records for both www.example[.]com and foobar.example[.]com, how are they any different? foobar and www are both subdomains of example[.]com, no?

      1 reply 0 retweets 0 likes
    3. symmetric (Brandon Enright)‏ @bmenrigh 11 Sep 2018
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      Replying to @David3141593 @gdead

      The things between the periods are "labels". "com" is a label and is also the top-level-domain (TLD). "example" is a domain (and a subdomain of com). "www" is a hostname. For names like http://www.us.example.com  then the "us" part would be a subdomain of http://example.com 

      1 reply 0 retweets 0 likes
    4. Dаvіd Вucһаnаn‏ @David3141593 11 Sep 2018
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      Replying to @bmenrigh @gdead

      So www is a special case? Where is this defined? I still don't understand what makes "www" a hostname, but "us" a subdomain, in your example.

      2 replies 0 retweets 0 likes
    5. symmetric (Brandon Enright)‏ @bmenrigh 11 Sep 2018
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      Replying to @David3141593 @gdead

      The difference is really in the "domain" part of the word subdomain. (sub)domains have hostnames and possibly further subdomains under them. Since www is just and A record without anything under it, it's just a hostname.

      1 reply 0 retweets 0 likes
      Dаvіd Вucһаnаn‏ @David3141593 11 Sep 2018
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      Replying to @bmenrigh @gdead

      That seems very arbitrary. What if "us" had no records under it, whereas foo.www.example[.]com existed?

      5:13 PM - 11 Sep 2018
      1 reply 0 retweets 0 likes
        1. symmetric (Brandon Enright)‏ @bmenrigh 11 Sep 2018
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          Replying to @David3141593 @gdead

          Well now we're getting into the technical weeds of DNS but for something to be a (sub)domain there must be an SOA record saying what nameserver the (sub)domain is delegated to. And corresponding NS record and A record for the authoritative nameserver.

          0 replies 0 retweets 3 likes
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