Tongue twister: The number of possible IPv6 addresses read out loud

IPv6 can theoretically hold 2^128 IP addresses. As you’re probably aware of, that’s a huge number:
2^128 = 340,282,366,920,938,463,463,374,607,431,768,211,456
Have you ever wondered how you would actually SAY that number if you had to read it out loud? A cool thing with Wolfram Alpha is that it will spell out numbers for you, making it possible for us to find this out without too much of a headache. Here’s the text version of the number:
340 undecillion, 282 decillion, 366 nonillion, 920 octillion, 938 septillion, 463 sextillion, 463 quintillion, 374 quadrillion, 607 trillion, 431 billion, 768 million, 211 thousand and 456
Read it out loud really fast. A bit of a mouthful… 🙂

We write about IPv6 from time to time in this blog. You might want to check out a couple of our previous articles:


  1. For correct verbalization, the word “AND” should be used only to denote the location of the decimal, as in 100.21 would be one-hundred and 21 cents, (or hundredths), etc.

  2. How does this number compare to the number of stars in the universe, or even better, the number of atoms in the universe (estimated, of course)?

  3. According to Wikipedia, the estimated numbers of atoms in the universe is ~10^80, or 100 quinvigintillion

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