2018-05-13 23:11:13 +02:00
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---
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layout: "functions"
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2018-12-20 05:35:11 +01:00
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page_title: "cidrhost - Functions - Configuration Language"
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2018-05-13 23:11:13 +02:00
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sidebar_current: "docs-funcs-ipnet-cidrhost"
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description: |-
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The cidrhost function calculates a full host IP address within a given
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IP network address prefix.
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---
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# `cidrhost` Function
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2019-01-17 01:33:57 +01:00
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-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
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earlier, see
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[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
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2018-05-13 23:11:13 +02:00
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`cidrhost` calculates a full host IP address for a given host number within
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a given IP network address prefix.
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```hcl
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cidrhost(prefix, hostnum)
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```
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`prefix` must be given in CIDR notation, as defined in
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[RFC 4632 section 3.1](https://tools.ietf.org/html/rfc4632#section-3.1).
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`hostnum` is a whole number that can be represented as a binary integer with
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no more than the number of digits remaining in the address after the given
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prefix.
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This function accepts both IPv6 and IPv4 prefixes, and the result always uses
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the same addressing scheme as the given prefix.
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## Examples
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```
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> cidrhost("10.12.127.0/20", 16)
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10.12.112.16
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> cidrhost("10.12.127.0/20", 268)
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10.12.113.12
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> cidrhost("fd00:fd12:3456:7890:00a2::/72", 34)
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fd00:fd12:3456:7890::22
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```
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## Related Functions
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* [`cidrsubnet`](./cidrsubnet.html) calculates a subnet address under a given
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network address prefix.
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