[#CSubNet-2constructor-07]
= xref:CSubNet.adoc[CSubNet]::CSubNet
:relfileprefix: ../
:mrdocs:

Construct from a given network start and number of bits (CIDR mask).

== Synopsis

Declared in `<netaddress.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CSubNet(
    xref:CNetAddr.adoc[CNetAddr] const& addr,
    uint8_t mask);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *addr* [in]
| Network start. Must be IPv4 or IPv6, otherwise an invalid subnet is created.
| *mask* [in]
| CIDR mask, must be in [0, 32]for IPv4 addresses and in [0, 128]for IPv6 addresses. Otherwise an invalid subnet is created.
|===


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