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Comment by num3thod | Hacker News Reader

I just realised how online adult entertainment has the most redundancy of any Internet service category, bar none.

You’re right :)

  $ dig @8.8.8.8 ns +short pornhub.com
  ns2.p44.dynect.net.
  ns3.p44.dynect.net.
  ns4.p44.dynect.net.
  sdns3.ultradns.net.
  sdns3.ultradns.com.
  sdns3.ultradns.org.
  sdns3.ultradns.biz.
  ns1.p44.dynect.net.

PornHub has better DNS redundancy than Github and Twitter.

I'm sure this is to circumvent blacklisting rather than for this scenario.

I can’t think of any type of blacklisting this would prevent. Care you elaborate?

Amazon does too:

  C:\>nslookup

  > set type=ns
  > amazon.com

  Non-authoritative answer:
  amazon.com      nameserver = ns3.p31.dynect.net
  amazon.com      nameserver = pdns1.ultradns.net
  amazon.com      nameserver = ns4.p31.dynect.net
  amazon.com      nameserver = pdns6.ultradns.co.uk
  amazon.com      nameserver = ns1.p31.dynect.net
  amazon.com      nameserver = ns2.p31.dynect.net

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