user323: Anyone can generate a vanity address of arbitrary length with appropriate tools, it's just a matter of performing enough computations. What is the longest known vanity address anyone has generated?

user49559: Here is one we created for our nonprofit. hugpuddle.org 
it took several months for us to find it.
1HuGpUDDLEhvehXE1P6xeudqAHqKfs1BFM

user11112: 1GEnesisReVC...U2
1GEnesisReVCQG641yERVQgStUvqH6S9U2

➡️ blockchain.info block explorer
On Mac Pro with GPU it was 9 days to have 50% chance of genesisre (not case sensitive)
Was using https://github.com/exploitagency/vanitygen-plus
What I really like about this address:

capitalization of GEnesisRe
VC suffix
memorable U2 ending
capitalization right after VC
capitalization just before U2


OK, so right now time to raise some money and open a VC fund investing in regenerative communities - independent food, energy, water production and focus on education and new post-scarcity paradigm economy.


EDIT / UPDATE: Out of curiosity tried running the command as if I was to bruteforce it with the exact capitalisation:
Difficulty: 9883693997182075238
[20.44 Mkey/s][total 398458880][Prob 0.0%][50% in 10630.3y] 

With -i (case insensitive):
Difficulty: 18982355007608803
[19.72 Mkey/s][total 230686720][Prob 0.0%][50% in 21.2y] 

Bottom line - got lucky, incredibly lucky.

EDIT / UPDATE:
I wanted to send the minimal transaction (546 Satoshis) and be included in the block but they happened almost instantly, what a chance!
Don't trust, verify. Happy Bitcoin halving! Monday 11th May 2020
Gyf//ybT1XGwV6sOhZf0yCFn1QLmGoD+x/K3x2L+kaqBfKpM8wQb30/8wW3DUT6AQkZUiKIXMfgafQx3cT7e658=

I'm Craig Wright, definitely not a fraud.

user51198: Here's what vanity address I generated:
1DETACHABLEDD7hgExqScWngMrxDGtXwcX
This is the real word. All characters in the pattern are uppercase. The length of the pattern is 11 characters.

user5414: There's this thread on bitcoin talk:
https://bitcointalk.org/index.php?topic=90982.0
I personally generated this address: 1BoyishnessfwHq3wSkCkJ7iafUdjhghfU which is the longest one I'm aware of that's not mixed case. It was generated by feeding oclvanitygen a large number of potential prefixes from a large wordlist.

user659: It's impossible to say for sure what's a vanity address and what's generated purely at random, but 1CFBdvaiZgZPTZERqnezAtDQJuGHKoHSzg is 34 characters with no digits in it other than the initial '1'.  That may well be a vanity address.  Then again on average 1 in every 515 34-character addresses you generate won't have any digits in them other than the leading 1, so possibly not.
The address with the longest initial list of lower-case letters is 1yaniraswqyghuJKCRrGwJUA2HakWtRad, and is clearly a vanity address since it appears in the same transaction as many other vanity addresses.
Edit: I just found this one:
1QBDLYTDFHHZAABYSKGKPWKLSXZWCCJQBX

It belongs to etotheipi, author of the Armory Bitcoin Client, and was found using vanitygen, as he said in a bitcointalk forum post:

Yessir!  I got a little crazy with vanitygen and succeeded.  It
  should've taken about 70 days of computation time but I got lucky and
  found it in about a week...  (notice no digits either, only uppercase
  letters).
Unfortunately, it's so cool that people don't even recognize it as a
  Bitcoin address :)


323: <p>Anyone can generate a <a href="https://bitcointalk.org/index.php?topic=25804.0">vanity address</a> of arbitrary length with appropriate tools, it's just a matter of performing enough computations. What is the longest known vanity address anyone has generated?</p>
 49559: <p>Here is one we created for our nonprofit. hugpuddle.org 
it took several months for us to find it.
1HuGpUDDLEhvehXE1P6xeudqAHqKfs1BFM</p>
 11112: <h3><code>1GEnesisReVC...U2</code></h3>
<pre><code>1GEnesisReVCQG641yERVQgStUvqH6S9U2
</code></pre>
<p>➡️ <a href="https://www.blockchain.com/btc/address/1GEnesisReVCQG641yERVQgStUvqH6S9U2" rel="nofollow noreferrer">blockchain.info block explorer</a></p>
<p>On Mac Pro with GPU it was 9 days to have 50% chance of <code>genesisre</code> <em>(not case sensitive)</em></p>
<p>Was using <a href="https://github.com/exploitagency/vanitygen-plus" rel="nofollow noreferrer">https://github.com/exploitagency/vanitygen-plus</a></p>
<p>What I really like about this address:</p>
<ul>
<li>capitalization of <code>GEnesisRe</code></li>
<li><code>VC</code> suffix</li>
<li>memorable <code>U2</code> ending</li>
<li>capitalization right after <code>VC</code></li>
<li>capitalization just before <code>U2</code></li>
</ul>
<blockquote>
<p>OK, so right now time to raise some money and open a VC fund investing in regenerative communities - independent food, energy, water production and focus on education and new post-scarcity paradigm economy.</p>
</blockquote>
<hr />
<p><strong>EDIT / UPDATE:</strong> Out of curiosity tried running the command as if I was to bruteforce it with the exact capitalisation:</p>
<pre><code>Difficulty: 9883693997182075238
[20.44 Mkey/s][total 398458880][Prob 0.0%][50% in 10630.3y] 
</code></pre>
<p>With <code>-i</code> (case insensitive):</p>
<pre><code>Difficulty: 18982355007608803
[19.72 Mkey/s][total 230686720][Prob 0.0%][50% in 21.2y] 
</code></pre>
<p>Bottom line - got lucky, incredibly lucky.</p>
<hr />
<p><strong>EDIT / UPDATE:</strong></p>
<p>I wanted to send the minimal transaction (546 Satoshis) and be included in the block but they happened almost instantly, what a chance!</p>
<p><code>Don't trust, verify. Happy Bitcoin halving! Monday 11th May 2020</code></p>
<p><code>Gyf//ybT1XGwV6sOhZf0yCFn1QLmGoD+x/K3x2L+kaqBfKpM8wQb30/8wW3DUT6AQkZUiKIXMfgafQx3cT7e658=</code></p>
<p><a href="https://i.stack.imgur.com/hjMkd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hjMkd.png" alt="enter image description here" /></a></p>
<h1>I'm Craig Wright, definitely not a fraud.</h1>
 51198: <p>Here's what vanity address I generated:</p>

<p><strong>1DETACHABLED</strong>D7hgExqScWngMrxDGtXwcX</p>

<p>This is the real word. All characters in the pattern are uppercase. The length of the pattern is 11 characters.</p>
 5414: <p>There's this thread on bitcoin talk:</p>

<p><a href="https://bitcointalk.org/index.php?topic=90982.0">https://bitcointalk.org/index.php?topic=90982.0</a></p>

<p>I personally generated this address: 1<b>Boyishness</b>fwHq3wSkCkJ7iafUdjhghfU which is the longest one I'm aware of that's not mixed case. It was generated by feeding oclvanitygen a large number of potential prefixes from a large wordlist.</p>
 659: <p>It's impossible to say for sure what's a vanity address and what's generated purely at random, but <a href="http://blockexplorer.com/address/1CFBdvaiZgZPTZERqnezAtDQJuGHKoHSzg">1CFBdvaiZgZPTZERqnezAtDQJuGHKoHSzg</a> is 34 characters with no digits in it other than the initial '1'.  That may well be a vanity address.  Then again on average <a href="http://www.wolframalpha.com/input/?i=1%2Fpow%28%2848.0%2F58%29%2C33%29jjjj">1 in every 515</a> 34-character addresses you generate won't have any digits in them other than the leading 1, so possibly not.</p>

<p>The address with the longest initial list of lower-case letters is <a href="http://blockexplorer.com/address/1yaniraswqyghuJKCRrGwJUA2HakWtRad">1yaniraswqyghuJKCRrGwJUA2HakWtRad</a>, and is clearly a vanity address since it appears in the <a href="http://blockexplorer.com/tx/751ff11286a43da5d6cf7da8f5bc736e522bbd698ec03c76c63368e5260667e6#o175">same transaction</a> as many other vanity addresses.</p>

<p><strong>Edit:</strong> I just found this one:</p>

<pre><code>1QBDLYTDFHHZAABYSKGKPWKLSXZWCCJQBX
</code></pre>

<p>It belongs to etotheipi, author of the <a href="http://bitcoinarmory.com/">Armory Bitcoin Client</a>, and was found using vanitygen, as he said in a <a href="https://bitcointalk.org/index.php?topic=64449.msg809780#msg809780">bitcointalk forum post</a>:</p>

<blockquote>
  <p>Yessir!  I got a little crazy with vanitygen and succeeded.  It
  should've taken about 70 days of computation time but I got lucky and
  found it in about a week...  (notice no digits either, only uppercase
  letters).</p>
  
  <p>Unfortunately, it's so cool that people don't even recognize it as a
  Bitcoin address :)</p>
</blockquote>
