Tumblr also has hostnames that end in hyphens.

Regardless, if there is a publicly available web address at a given
hostname, albeit with an invalid hostname, this "not a bug" prevents
almost any program-level function from accessing said publicly available
web addresses. For example, curl, PHP, web browsers are all affected
because they utilize gethostbyname() somewhere in their process chain.
Do these programs need to stop using gethostbyname() and start adopting
a new method of resolving hostnames in order to access said web
addresses?

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https://bugs.launchpad.net/bugs/144431

Title:
  gethostbyname() cant resolve names starting/ending with "-"

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