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# fuchsia.net

<div class="fidl-version-div"><span class="fidl-attribute fidl-version">Added: 7</span></div>


## **STRUCTS**

### Ipv4Address  {#Ipv4Address data-text="Ipv4Address"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=31)*
<p>Ipv4Address is expressed in network byte order, so the most significant byte
(&quot;127&quot; in the address &quot;127.0.0.1&quot;) will be at index 0.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Ipv4Address.addr">
            <td><code>addr</code></td>
            <td>
                <code>uint8[4]</code>
            </td>
            <td></td>
            <td>No default</td>
        </tr>
</table>

### Ipv4AddressWithPrefix  {#Ipv4AddressWithPrefix data-text="Ipv4AddressWithPrefix"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=62)*
<p>An IPv4 address with its subnet prefix length.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Ipv4AddressWithPrefix.addr">
            <td><code>addr</code></td>
            <td>
                <code><a class='link' href='#Ipv4Address'>Ipv4Address</a></code>
            </td>
            <td><p>The IPv4 address.</p>
</td>
            <td>No default</td>
        </tr>
        <tr id="Ipv4AddressWithPrefix.prefix_len">
            <td><code>prefix_len</code></td>
            <td>
                <code>uint8</code>
            </td>
            <td><p>The prefix length. Must be in the range [0, 32].</p>
</td>
            <td>No default</td>
        </tr>
</table>

### Ipv4SocketAddress  {#Ipv4SocketAddress data-text="Ipv4SocketAddress"}
*Defined in [fuchsia.net/socket.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/socket.fidl;l=11)*
<p>An IPv4 socket address, composed of an IPv4 address and a port.</p>
<p>Inspired by the address definition in the <a href="https://pubs.opengroup.org/onlinepubs/9699919799/">POSIX specification</a>.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Ipv4SocketAddress.address">
            <td><code>address</code></td>
            <td>
                <code><a class='link' href='#Ipv4Address'>Ipv4Address</a></code>
            </td>
            <td><p>IPv4 Address.</p>
</td>
            <td>No default</td>
        </tr>
        <tr id="Ipv4SocketAddress.port">
            <td><code>port</code></td>
            <td>
                <code>uint16</code>
            </td>
            <td><p>Transport-layer port.</p>
</td>
            <td>No default</td>
        </tr>
</table>

### Ipv6Address  {#Ipv6Address data-text="Ipv6Address"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=37)*
<p>Ipv6Address is expressed in network byte order, so the most significant byte
(&quot;ff&quot; in the address &quot;ff02::1&quot;) will be at index 0.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Ipv6Address.addr">
            <td><code>addr</code></td>
            <td>
                <code>uint8[16]</code>
            </td>
            <td></td>
            <td>No default</td>
        </tr>
</table>

### Ipv6AddressWithPrefix  {#Ipv6AddressWithPrefix data-text="Ipv6AddressWithPrefix"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=71)*
<p>An IPv6 address with its subnet prefix length.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Ipv6AddressWithPrefix.addr">
            <td><code>addr</code></td>
            <td>
                <code><a class='link' href='#Ipv6Address'>Ipv6Address</a></code>
            </td>
            <td><p>The IPv6 address.</p>
</td>
            <td>No default</td>
        </tr>
        <tr id="Ipv6AddressWithPrefix.prefix_len">
            <td><code>prefix_len</code></td>
            <td>
                <code>uint8</code>
            </td>
            <td><p>The prefix length. Must be in the range [0, 128].</p>
</td>
            <td>No default</td>
        </tr>
</table>

### Ipv6SocketAddress  {#Ipv6SocketAddress data-text="Ipv6SocketAddress"}
*Defined in [fuchsia.net/socket.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/socket.fidl;l=23)*
<p>An IPV6 socket address, composed of an IPv6 address, a port, and a scope identifier.</p>
<p>Inspired by the address definition in the <a href="https://pubs.opengroup.org/onlinepubs/9699919799/">POSIX specification</a>.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Ipv6SocketAddress.address">
            <td><code>address</code></td>
            <td>
                <code><a class='link' href='#Ipv6Address'>Ipv6Address</a></code>
            </td>
            <td><p>IPv6 Address.</p>
</td>
            <td>No default</td>
        </tr>
        <tr id="Ipv6SocketAddress.port">
            <td><code>port</code></td>
            <td>
                <code>uint16</code>
            </td>
            <td><p>Transport-layer port.</p>
</td>
            <td>No default</td>
        </tr>
        <tr id="Ipv6SocketAddress.zone_index">
            <td><code>zone_index</code></td>
            <td>
                <code><a class='link' href='#interface_id'>interface_id</a></code>
            </td>
            <td><p>Provides a means to identify to which zone a non-global address belongs.</p>
<p>A node may have interfaces attached to different zones of the same scope, for example
different link-local zones are disambiguated by the use of a <code>zone_index</code> providing the
interface identifier.</p>
<p><code>zone_index</code> 0 is the default zone.</p>
<p>See <a href="https://tools.ietf.org/html/rfc4007">RFC 4007</a> for terminology and examples.</p>
</td>
            <td>No default</td>
        </tr>
</table>

### MacAddress  {#MacAddress data-text="MacAddress"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=80)*
<p>A MAC address used to identify a network interface on the data link layer within the network.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="MacAddress.octets">
            <td><code>octets</code></td>
            <td>
                <code>uint8[6]</code>
            </td>
            <td></td>
            <td>No default</td>
        </tr>
</table>

### Subnet  {#Subnet data-text="Subnet"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=50)*
<p>An IP address with its subnet prefix length.</p>

<table>
    <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
        <tr id="Subnet.addr">
            <td><code>addr</code></td>
            <td>
                <code><a class='link' href='#IpAddress'>IpAddress</a></code>
            </td>
            <td><p>The IPv4 or IPv6 address.</p>
</td>
            <td>No default</td>
        </tr>
        <tr id="Subnet.prefix_len">
            <td><code>prefix_len</code></td>
            <td>
                <code>uint8</code>
            </td>
            <td><p>The prefix length of the netmask. E.g. for 192.168.1.0/24, the prefix
length is 24, corresponding to a netmask of 255.255.255.0.
For Ipv4, prefix_len must be in the range [0, 32].
For Ipv6, prefix_len must be in the range [0, 128].</p>
</td>
            <td>No default</td>
        </tr>
</table>


## **ENUMS**

### IpVersion [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute} {#IpVersion data-text="IpVersion"}
Type: <code>uint32</code>

*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=24)*
<p>IpVersion is an IP version.</p>

<table>
    <tr><th>Name</th><th>Value</th><th>Description</th></tr>
        <tr id="IpVersion.V4">
<td><h3 id="IpVersion.V4" class="add-link hide-from-toc">V4</h3></td>
            <td><code>1</code></td>
            <td></td>
        </tr>
        <tr id="IpVersion.V6">
<td><h3 id="IpVersion.V6" class="add-link hide-from-toc">V6</h3></td>
            <td><code>2</code></td>
            <td></td>
        </tr>
</table>


## **UNIONS**

### IpAddress [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#IpAddress data-text="IpAddress"}
*Defined in [fuchsia.net/net.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=42)*
<p>Represents an IP address that may be either v4 or v6.</p>
<table>
    <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
        <tr id="IpAddress.ipv4">
<td><h3 id="IpAddress.ipv4" class="add-link hide-from-toc">1</h3></td>
            <td><code>ipv4</code></td>
            <td>
                <code><a class='link' href='#Ipv4Address'>Ipv4Address</a></code>
            </td>
            <td></td>
        </tr>
        <tr id="IpAddress.ipv6">
<td><h3 id="IpAddress.ipv6" class="add-link hide-from-toc">2</h3></td>
            <td><code>ipv6</code></td>
            <td>
                <code><a class='link' href='#Ipv6Address'>Ipv6Address</a></code>
            </td>
            <td></td>
        </tr>
</table>

### SocketAddress [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#SocketAddress data-text="SocketAddress"}
*Defined in [fuchsia.net/socket.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/socket.fidl;l=43)*
<p>Represents an IP socket address that may be either v4 or v6.</p>
<table>
    <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
        <tr id="SocketAddress.ipv4">
<td><h3 id="SocketAddress.ipv4" class="add-link hide-from-toc">1</h3></td>
            <td><code>ipv4</code></td>
            <td>
                <code><a class='link' href='#Ipv4SocketAddress'>Ipv4SocketAddress</a></code>
            </td>
            <td></td>
        </tr>
        <tr id="SocketAddress.ipv6">
<td><h3 id="SocketAddress.ipv6" class="add-link hide-from-toc">2</h3></td>
            <td><code>ipv6</code></td>
            <td>
                <code><a class='link' href='#Ipv6SocketAddress'>Ipv6SocketAddress</a></code>
            </td>
            <td></td>
        </tr>
</table>


## **CONSTANTS**

<table>
    <tr><th>Name</th><th>Value</th><th>Type</th><th>Description</th></tr>
        <tr id="MAX_HOSTNAME_SIZE">
            <td><a href="https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=9">MAX_HOSTNAME_SIZE</a></td>
                <td>
                    <code>255</code>
                </td>
                <td><code>uint64</code></td>
            <td><p>The maximum length of a hostname, as per
<a href="https://tools.ietf.org/html/rfc1035#section-2.3.4">RFC 1035 section 2.3.4</a>.</p>
</td>
        </tr>
</table>

## **TYPE ALIASES**

<table>
    <tr><th>Name</th><th>Value</th><th>Description</th></tr>
        <tr id="Hostname">
            <td><a href="https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=18">Hostname</a></td>
            <td>
                <code>string</code>[<code><a class='link' href='#MAX_HOSTNAME_SIZE'>MAX_HOSTNAME_SIZE</a></code>]</td>
            <td><p>A hostname.</p>
<p>Although the maximum length of a domain or hostname is 255 characters,
each label within a name must not be longer than 63 characters as per
<a href="https://tools.ietf.org/html/rfc1035#section-2.3.4">RFC 1035 section 2.3.4</a>.
A label in a host name is the alphanumeric characters or hyphens, seperated
by a period (e.g. abc.com has two labels, 'abc' and 'com').</p>
</td>
        </tr>
        <tr id="interface_id">
            <td><a href="https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net/net.fidl;l=21">interface_id</a></td>
            <td>
                <code>uint64</code></td>
            <td><p>A unique non-zero interface identifier.</p>
</td>
        </tr>
</table>