# Private Build Instances Public Rack

**URL:** https://community.convox.com/t/private-build-instances-public-rack/476
**Category:** Rack (Version 2)
**Created:** [March 28, 2019, 10:13am UTC](https://community.convox.com/t/private-build-instances-public-rack/476 "2019-03-28T10:13:59Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![patrik.trelsmo](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@patrik.trelsmo](https://community.convox.com/u/patrik.trelsmo)
#### Post date: [March 28, 2019, 10:13am UTC](https://community.convox.com/t/private-build-instances-public-rack/476/1 "2019-03-28T10:13:59Z")

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Hi,

I need a NAT Gateway to have known IP addresses for my builds in Convox, but I don’t need NAT Gateways for my serving instances (it’s quite expensive).

Is there a way to make the build instances launch in subnets with NAT Gateways but the serving instances launch in public subnets?

Cheers,  
Patrik