# How is the Node ID created?

**URL:** https://discuss.aerospike.com/t/how-is-the-node-id-created/283
**Category:** Configuration
**Created:** [August 16, 2014, 1:01am UTC](https://discuss.aerospike.com/t/how-is-the-node-id-created/283 "2014-08-16T01:01:42Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![oldforum](https://avatars.discourse-cdn.com/v4/letter/o/13edae/32.png) [@oldforum](https://discuss.aerospike.com/u/oldforum)
#### Post date: [August 16, 2014, 1:01am UTC](https://discuss.aerospike.com/t/how-is-the-node-id-created/283/1 "2014-08-16T01:01:42Z")

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In various place I see referece to the node id (or nodeid). How is this generated?

What impact does it have?

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<div class="post-metadata">

### Author: ![meher](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/meher/32/1644_2.png) [@meher](https://discuss.aerospike.com/u/meher)
#### Post date: [August 16, 2014, 1:02am UTC](https://discuss.aerospike.com/t/how-is-the-node-id-created/283/2 "2014-08-16T01:02:39Z")

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Understanding Node id to mac address translation:

Assume your Mac Address is : # HWaddr 20:CF:30:ED:D8:E4

And fabric port is configured to use port 3001

In that case Node id will be : BB9E4D8ED30CF20

Explanation:

First 3 characters BB9 (0 is removed by print) - this relates to port 3001 in aerospike.conf

E4D8ED30CF20 - Rest is the mac address in reverse order of mac address (20:CF:30:ED:D8:E4)