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Updated on 2024-05-21 GMT+08:00
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Network Address Types

GaussDB offers data types to store IPv4 and MAC addresses.

It is better to use these types instead of plain text types to store network addresses, because these types offer input error checking and specialized operators and functions (see Network Address Functions and Operators).

Table 1 Network address types

Name

Storage Space

Description

cidr

7 bytes

IPv4 networks

inet

7 bytes

IPv4 hosts and networks

macaddr

6 bytes

MAC address

cidr

The cidr type (Classless Inter-Domain Routing) holds an IPv4 network address. The format for specifying networks is address/y where address is the network represented as an IPv4 address, and y is the number of bits in the netmask. If y is omitted, it is calculated using assumptions from the older classful network numbering system, except it will be at least large enough to include all of the octets written in the input. For details, see Table 2.

Table 2 cidr type input examples

cidr Input

cidr Output

abbrev(cidr)

192.168.100.128/25

192.168.100.128/25

192.168.100.128/25

192.168/24

192.168.0.0/24

192.168.0/24

192.168/25

192.168.0.0/25

192.168.0.0/25

192.168.1

192.168.1.0/24

192.168.1/24

192.168

192.168.0.0/24

192.168.0/24

10.1.2

10.1.2.0/24

10.1.2/24

10.1

10.1.0.0/16

10.1/16

10

10.0.0.0/8

10/8

10.1.2.3/32

10.1.2.3/32

10.1.2.3/32

inet

The inet type holds an IPv4 host address, and optionally its subnet, all in one field. The subnet is represented by the number of network address bits present in the host address (the "netmask"). If the netmask is 32 and the address is an IPv4 address, then the value does not indicate a subnet, only a single host.

The input format for this type is address/y where address is an IPv4 address and y is the number of bits in the netmask. If the /y portion is omitted, the netmask is 32 for an IPv4 address, and the value represents just a single host. On display, the /y portion is suppressed if the netmask specifies a single host.

The essential difference between the inet and cidr data types is that inet accepts values with nonzero bits to the right of the netmask, whereas cidr does not.

macaddr

The macaddr type stores MAC addresses, known for example from Ethernet card hardware addresses (although MAC addresses are used for other purposes as well). Input is accepted in the following formats:

'08:00:2b:01:02:03'
'08-00-2b-01-02-03'
'08002b:010203'
'08002b-010203'
'0800.2b01.0203'
'08002b010203'

These examples would all specify the same address. Upper and lower cases are accepted for the digits a through f. Output is always in the first of the forms shown.

Parent topic: Data Type