user48158: I'm running a pruned full node of bitcoin core version 0.14.0 and checking on https://bitnodes.21.co/nodes/ I can see that my node was labelled "NODE_WITNESS (12)" unlike of the others nodes shown, which was labelled "NODE_WITNESS (13)".

user5406: I've looked through several pages on bitnodes to find some more nodes that show NODE_WITNESS (12). I've noticed a pattern: the number corresponds to the services that a node offers. Nodes advertise the services that they offer by sending a bitmap named nServices. The number in the brackets matches the decimal representation of the service bits that a node has set.
Looking around a bit, I've identified the following five bits:

NODE_NETWORK (1)
NODE_GETUTXO (2)
NODE_BLOOM (4)
NODE_WITNESS (8)
NODE_XTHIN (16), discontinued
NODE_COMPACT_FILTERS  (64)
NODE_NETWORK_LIMITED (1024)

So, I'd say that with (12), you must be offering the services NODE_BLOOM, NODE_WITNESS (12), lemme guess, you run a pruning node? :) Or would it be "blocksonly"?

Edit: Here are the service bits defined in the source code: protocol.h:271. And here is an overview in the Bitcoin Wiki page for protocol documentation.

48158: <p>I'm running a pruned full node of bitcoin core version 0.14.0 and checking on <a href="https://bitnodes.21.co/nodes/" rel="nofollow noreferrer">https://bitnodes.21.co/nodes/</a> I can see that my node was labelled "NODE_WITNESS (12)" unlike of the others nodes shown, which was labelled "NODE_WITNESS (13)".</p>
 5406: <p>I've looked through several pages on bitnodes to find some more nodes that show <code>NODE_WITNESS (12)</code>. I've noticed a pattern: the number corresponds to the services that a node offers. Nodes advertise the services that they offer by sending a bitmap named <code>nServices</code>. The number in the brackets matches the decimal representation of the service bits that a node has set.</p>
<p>Looking around a bit, I've identified the following five bits:</p>
<ul>
<li><code>NODE_NETWORK (1)</code></li>
<li><code>NODE_GETUTXO (2)</code></li>
<li><code>NODE_BLOOM (4)</code></li>
<li><code>NODE_WITNESS (8)</code></li>
<li><code>NODE_XTHIN (16)</code>, discontinued</li>
<li><code>NODE_COMPACT_FILTERS  (64)</code></li>
<li><code>NODE_NETWORK_LIMITED (1024)</code></li>
</ul>
<p>So, I'd say that with (12), you must be offering the services <code>NODE_BLOOM, NODE_WITNESS (12)</code>, lemme guess, you run a pruning node? :) Or would it be &quot;blocksonly&quot;?</p>
<hr />
<p>Edit: Here are the service bits defined in the source code: <a href="https://github.com/bitcoin/bitcoin/blob/a9f642870849dcbfe32632fd6614804be61ab40c/src/protocol.h#L271" rel="nofollow noreferrer"><code>protocol.h:271</code></a>. And here is an overview in the Bitcoin Wiki page for <a href="https://en.bitcoin.it/wiki/Protocol_documentation#version" rel="nofollow noreferrer">protocol documentation</a>.</p>
