class QHostAddress#

The QHostAddress class provides an IP address. More…

Synopsis#

Methods#

def __init__()
def clear()
def isBroadcast()
def isEqual()
def isGlobal()
def isInSubnet()
def isLinkLocal()
def isLoopback()
def isMulticast()
def isNull()
def isPrivateUse()
def isSiteLocal()
def isUniqueLocalUnicast()
def __ne__()
def __eq__()
def protocol()
def scopeId()
def setAddress()
def setScopeId()
def swap()
def toIPv4Address()
def toIPv6Address()
def toString()

Static functions#

def parseSubnet()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description#

This class holds an IPv4 or IPv6 address in a platform- and protocol-independent manner.

QHostAddress is normally used with the QTcpSocket , QTcpServer , and QUdpSocket to connect to a host or to set up a server.

A host address is set with setAddress() , and retrieved with toIPv4Address() , toIPv6Address() , or toString() . You can check the type with protocol() .

Note

Please note that QHostAddress does not do DNS lookups. QHostInfo is needed for that.

The class also supports common predefined addresses: Null , LocalHost , LocalHostIPv6 , Broadcast , and Any .

See also

QHostInfo QTcpSocket QTcpServer QUdpSocket

class SpecialAddress#

Constant	Description
QHostAddress.Null	The null address object. Equivalent to `QHostAddress()` . See also `isNull()` .
QHostAddress.LocalHost	The IPv4 localhost address. Equivalent to `QHostAddress` (“127.0.0.1”).
QHostAddress.LocalHostIPv6	The IPv6 localhost address. Equivalent to `QHostAddress` (“::1”).
QHostAddress.Broadcast	The IPv4 broadcast address. Equivalent to `QHostAddress` (“255.255.255.255”).
QHostAddress.AnyIPv4	The IPv4 any-address. Equivalent to `QHostAddress` (“0.0.0.0”). A socket bound with this address will listen only on IPv4 interfaces.
QHostAddress.AnyIPv6	The IPv6 any-address. Equivalent to `QHostAddress` (“::”). A socket bound with this address will listen only on IPv6 interfaces.
QHostAddress.Any	The dual stack any-address. A socket bound with this address will listen on both IPv4 and IPv6 interfaces.

class ConversionModeFlag#

Constant	Description
QHostAddress.StrictConversion	(inherits `enum.Flag`) Don’t convert IPv6 addresses to IPv4 when comparing two `QHostAddress` objects of different protocols, so they will always be considered different.
QHostAddress.ConvertV4MappedToIPv4	Convert IPv4-mapped IPv6 addresses (RFC 4291 sect. 2.5.5.2) when comparing. Therefore `QHostAddress` (“::ffff:192.168.1.1”) will compare equal to `QHostAddress` (“192.168.1.1”).
QHostAddress.ConvertV4CompatToIPv4	Convert IPv4-compatible IPv6 addresses (RFC 4291 sect. 2.5.5.1) when comparing. Therefore `QHostAddress` (“::192.168.1.1”) will compare equal to `QHostAddress` (“192.168.1.1”).
QHostAddress.ConvertLocalHost	Convert the IPv6 loopback addresses to its IPv4 equivalent when comparing. Therefore e.g. `QHostAddress` (“::1”) will compare equal to `QHostAddress` (“127.0.0.1”).
QHostAddress.ConvertUnspecifiedAddress	All unspecified addresses will compare equal, namely `AnyIPv4` , `AnyIPv6` and Any.
QHostAddress.TolerantConversion	Sets all three preceding flags.

See also

isEqual()

PySide6.QtNetwork.QHostAddress.IPv4Protocol#

PySide6.QtNetwork.QHostAddress.IPv6Protocol#

PySide6.QtNetwork.QHostAddress.AnyIPProtocol#

PySide6.QtNetwork.QHostAddress.UnknownNetworkLayerProtocol#

__init__(address)#

Parameters:: address – SpecialAddress

Constructs a QHostAddress object for address.

__init__()

Constructs a null host address object, i.e. an address which is not valid for any host or interface.

See also

clear()

__init__(ip4Addr)

Parameters:: ip4Addr – int

Constructs a host address object with the IPv4 address ip4Addr.

__init__(address)

Parameters:: address – str

Constructs an IPv4 or IPv6 address based on the string address (e.g., “127.0.0.1”).

See also

setAddress()

__init__(ip6Addr)

Parameters:: ip6Addr – QIPv6Address

__init__(copy)

Parameters:: copy – QHostAddress

Constructs a copy of the given address.

clear()#

Sets the host address to null and sets the protocol to UnknownNetworkLayerProtocol .

See also

Null

isBroadcast()#

Return type:: bool

Returns true if the address is the IPv4 broadcast address, false otherwise. The IPv4 broadcast address is 255.255.255.255.

Note that this function does not return true for an IPv4 network’s local broadcast address. For that, please use QNetworkInterface to obtain the broadcast addresses of the local machine.

See also

isLoopback() isGlobal() isMulticast() isLinkLocal() isUniqueLocalUnicast() isPrivateUse()

isEqual(address[, mode=QHostAddress.ConversionModeFlag.TolerantConversion])#

Parameters:

address – QHostAddress
mode – Combination of ConversionModeFlag

Return type:

bool

Returns true if this host address is the same as the other address given; otherwise returns false.

The parameter mode controls which conversions are performed between addresses of differing protocols. If no mode is given, TolerantConversion is performed by default.

See also

ConversionMode operator==()

isGlobal()#

Return type:: bool

Returns true if the address is an IPv4 or IPv6 global address, false otherwise. A global address is an address that is not reserved for special purposes (like loopback or multicast) or future purposes.

Note that IPv6 unique local unicast addresses are considered global addresses (see isUniqueLocalUnicast() ), as are IPv4 addresses reserved for local networks by RFC 1918.

Also note that IPv6 site-local addresses are deprecated and should be considered as global in new applications. This function returns true for site-local addresses too.

See also

isLoopback() isSiteLocal() isUniqueLocalUnicast() isPrivateUse()

isInSubnet(subnet, netmask)#

Parameters:

subnet – QHostAddress
netmask – int

Return type:

bool

Returns true if this IP is in the subnet described by the network prefix subnet and netmask netmask.

An IP is considered to belong to a subnet if it is contained between the lowest and the highest address in that subnet. In the case of IP version 4, the lowest address is the network address, while the highest address is the broadcast address.

The subnet argument does not have to be the actual network address (the lowest address in the subnet). It can be any valid IP belonging to that subnet. In particular, if it is equal to the IP address held by this object, this function will always return true (provided the netmask is a valid value).

See also

parseSubnet()

isInSubnet(subnet)

Parameters:: subnet – .std.pairQHostAddress,int
Return type:: bool

This is an overloaded function.

Returns true if this IP is in the subnet described by subnet. The QHostAddress member of subnet contains the network prefix and the int (second) member contains the netmask (prefix length).

isLinkLocal()#

Return type:: bool

Returns true if the address is an IPv4 or IPv6 link-local address, false otherwise.

An IPv4 link-local address is an address in the network 169.254.0.0/16. An IPv6 link-local address is one in the network fe80::/10. See the IANA IPv6 Address Space registry for more information.

See also

isLoopback() isGlobal() isMulticast() isSiteLocal() isUniqueLocalUnicast() isPrivateUse()

isLoopback()#

Return type:: bool

returns true if the address is the IPv6 loopback address, or any of the IPv4 loopback addresses.

isMulticast()#

Return type:: bool

Returns true if the address is an IPv4 or IPv6 multicast address, false otherwise.

See also

isLoopback() isGlobal() isLinkLocal() isSiteLocal() isUniqueLocalUnicast() isPrivateUse()

isNull()#

Return type:: bool

Returns true if this host address is not valid for any host or interface.

The default constructor creates a null address.

See also

Null

isPrivateUse()#

Return type:: bool

Returns true if the address is an IPv6 unique local unicast address or IPv4 address reserved for local networks by RFC 1918, false otherwise.

See also

isLoopback() isGlobal() isMulticast() isLinkLocal() isUniqueLocalUnicast() isBroadcast()

isSiteLocal()#

Return type:: bool

Returns true if the address is an IPv6 site-local address, false otherwise.

An IPv6 site-local address is one in the network fec0::/10. See the IANA IPv6 Address Space registry for more information.

IPv6 site-local addresses are deprecated and should not be depended upon in new applications. New applications should not depend on this function and should consider site-local addresses the same as global (which is why isGlobal() also returns true). Site-local addresses were replaced by Unique Local Addresses (ULA).

See also

isLoopback() isGlobal() isMulticast() isLinkLocal() isUniqueLocalUnicast() isPrivateUse()

isUniqueLocalUnicast()#

Return type:: bool

Returns true if the address is an IPv6 unique local unicast address, false otherwise.

An IPv6 unique local unicast address is one in the network fc00::/7. See the IANA IPv6 Address Space registry for more information.

Note that Unique local unicast addresses count as global addresses too. RFC 4193 says that, in practice, “applications may treat these addresses like global scoped addresses.” Only routers need care about the distinction.

See also

isLoopback() isGlobal() isMulticast() isLinkLocal() isPrivateUse()

__ne__(address)#

Parameters:: address – SpecialAddress
Return type:: bool

Returns true if this host address is not the same as the other address given; otherwise returns false.

__ne__(address)

Parameters:: address – QHostAddress
Return type:: bool

Returns true if this host address is not the same as the other address given; otherwise returns false.

__eq__(address)#

Parameters:: address – SpecialAddress
Return type:: bool

Returns true if this host address is the same as the other address given; otherwise returns false.

__eq__(address)

Parameters:: address – QHostAddress
Return type:: bool

Returns true if this host address is the same as the other address given; otherwise returns false. This operator just calls isEqual (other, StrictConversion ).

See also

isEqual()

static parseSubnet(subnet)#

Parameters:: subnet – str
Return type:: .std.pairQHostAddress,int

Parses the IP and subnet information contained in subnet and returns the network prefix for that network and its prefix length.

The IP address and the netmask must be separated by a slash (/).

This function supports arguments in the form:

123.123.123.123/n where n is any value between 0 and 32

123.123.123.123/255.255.255.255

<ipv6-address>/n where n is any value between 0 and 128

For IP version 4, this function accepts as well missing trailing components (i.e., less than 4 octets, like “192.168.1”), followed or not by a dot. If the netmask is also missing in that case, it is set to the number of octets actually passed (in the example above, it would be 24, for 3 octets).

See also

isInSubnet()

protocol()#

Return type:: NetworkLayerProtocol

Returns the network layer protocol of the host address.

scopeId()#

Return type:: str

Returns the scope ID of an IPv6 address. For IPv4 addresses, or if the address does not contain a scope ID, an empty QString is returned.

The IPv6 scope ID specifies the scope of reachability for non-global IPv6 addresses, limiting the area in which the address can be used. All IPv6 addresses are associated with such a reachability scope. The scope ID is used to disambiguate addresses that are not guaranteed to be globally unique.

IPv6 specifies the following four levels of reachability:

Node-local: Addresses that are only used for communicating with services on the same interface (e.g., the loopback interface “::1”).

Link-local: Addresses that are local to the network interface (link). There is always one link-local address for each IPv6 interface on your host. Link-local addresses (“fe80…”) are generated from the MAC address of the local network adaptor, and are not guaranteed to be unique.

Global: For globally routable addresses, such as public servers on the Internet.

When using a link-local or site-local address for IPv6 connections, you must specify the scope ID. The scope ID for a link-local address is usually the same as the interface name (e.g., “eth0”, “en1”) or number (e.g., “1”, “2”).

See also

setScopeId() QNetworkInterface interfaceFromName

setAddress(address)#

Parameters:: address – SpecialAddress

This is an overloaded function.

Sets the special address specified by address.

setAddress(ip4Addr)

Parameters:: ip4Addr – int

Set the IPv4 address specified by ip4Addr.

setAddress(address)

Parameters:: address – str
Return type:: bool

This is an overloaded function.

Sets the IPv4 or IPv6 address specified by the string representation specified by address (e.g. “127.0.0.1”). Returns true and sets the address if the address was successfully parsed; otherwise returns false.

setAddress(ip6Addr)

Parameters:: ip6Addr – QIPv6Address

setScopeId(id)#

Parameters:: id – str

Sets the IPv6 scope ID of the address to id. If the address protocol is not IPv6, this function does nothing. The scope ID may be set as an interface name (such as “eth0” or “en1”) or as an integer representing the interface index. If id is an interface name, QtNetwork will convert to an interface index using interfaceIndexFromName() before calling the operating system networking functions.

See also

scopeId() QNetworkInterface interfaceFromName

swap(other)#

Parameters:: other – QHostAddress

Swaps this host address with other. This operation is very fast and never fails.

toIPv4Address([ok=None])#

Parameters:: ok – bool
Return type:: int

Returns the IPv4 address as a number.

For example, if the address is 127.0.0.1, the returned value is 2130706433 (i.e. 0x7f000001).

This value is valid if the protocol() is IPv4Protocol , or if the protocol is IPv6Protocol , and the IPv6 address is an IPv4 mapped address (RFC4291). In those cases, ok will be set to true. Otherwise, it will be set to false.

See also

toString()

toIPv6Address()#

Return type:: QIPv6Address

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

Returns the IPv6 address as a Q_IPV6ADDR structure. The structure consists of 16 unsigned characters.

Q_IPV6ADDR addr = hostAddr.toIPv6Address()
# addr contains 16 unsigned characters
for i in range(0, 16):
    # process addr[i]

This value is valid if the protocol() is IPv6Protocol . If the protocol is IPv4Protocol , then the address is returned as an IPv4 mapped IPv6 address. (RFC4291)

See also

toString()

toString()#

Return type:: str

Returns the address as a string.

For example, if the address is the IPv4 address 127.0.0.1, the returned string is “127.0.0.1”. For IPv6 the string format will follow the RFC5952 recommendation. For Any , its IPv4 address will be returned (“0.0.0.0”)

See also

toIPv4Address()