<p>In the Kubernetes docs there is a <code>bootstrap token</code> which is used for Nodes TLS bootstrapping.
Wherever it is mentioned there is always the same value of <code>07401b.f395accd246ae52d</code>. I haven't found much details on if that numeric sequence have some special meaning and should be precisely the same for every bootstrapped Node. 
Or is that just a randomly generated magic number?</p>

esboych
<p>That sequence carries no special meaning. The bootstrap token is entirely random. I suspect the times that specific sequence is mentioned in documentation, it's coming from or directly copied from the same source. </p>

<blockquote>
  <p>Bootstrap Tokens take the form of abcdef.0123456789abcdef. More
  formally, they must match the regular expression
  [a-z0-9]{6}.[a-z0-9]{16}.</p>
  
  <p>The first part of the token is the “Token ID” and is considered public
  information. It is used when referring to a token without leaking the
  secret part used for authentication. The second part is the “Token
  Secret” and should only be shared with trusted parties.</p>
</blockquote>

<p><a href="https://kubernetes.io/docs/reference/access-authn-authz/bootstrap-tokens/#token-format" rel="nofollow noreferrer">https://kubernetes.io/docs/reference/access-authn-authz/bootstrap-tokens/#token-format</a></p>

<p>If you want to test this, play around with kubeadm's token create. This will generate random tokens you can use to bootstrap nodes.</p>

<blockquote>
  <p>kubeadm token create 
  Synopsis This command will create a bootstrap
  token for you. You can specify the usages for this token, the “time to
  live” and an optional human friendly description.</p>
  
  <p>The [token] is the actual token to write. This should be a securely
  generated random token of the form “[a-z0-9]{6}.[a-z0-9]{16}“. If no
  [token] is given, kubeadm will generate a random token instead.</p>
</blockquote>

<p><a href="https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-token/#cmd-token-create" rel="nofollow noreferrer">https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-token/#cmd-token-create</a></p>
