Manhattan Computer Services

Open a DOS windows in Windows XP (Start, All Programs, Accessories, Command Prompt). Enter at the command prompt enter ipconfig, e.g...

    C:Documents and SettingsLarry F. Byard>ipconfig

    Windows IP Configuration

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . :
    IP Address. . . . . . . . . . . . : 192.168.123.197
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.123.254

To obtain the syntax for ipconfig, enter ipconfig /?.

    C:Documents and SettingsLarry F. Byard>ipconfig /?

    USAGE:
    ipconfig [/? | /all | /renew [adapter] | /release [adapter] |
    /flushdns | /displaydns | /registerdns |
    /showclassid adapter |
    /setclassid adapter [classid] ]

    where
    adapter Connection name
    (wildcard characters * and ? allowed, see examples)

    Options:
    /? Display this help message
    /all Display full configuration information.
    /release Release the IP address for the specified adapter.
    /renew Renew the IP address for the specified adapter.
    /flushdns Purges the DNS Resolver cache.
    /registerdns Refreshes all DHCP leases and re-registers DNS names
    /displaydns Display the contents of the DNS Resolver Cache.
    /showclassid Displays all the dhcp class IDs allowed for adapter.
    /setclassid Modifies the dhcp class id.

    The default is to display only the IP address, subnet mask and
    default gateway for each adapter bound to TCP/IP.

    For Release and Renew, if no adapter name is specified, then the IP address
    leases for all adapters bound to TCP/IP will be released or renewed.

    For Setclassid, if no ClassId is specified, then the ClassId is removed.

    Examples:
    > ipconfig ... Show information.
    > ipconfig /all ... Show detailed information
    > ipconfig /renew ... renew all adapters
    > ipconfig /renew EL* ... renew any connection that has its

    name starting with EL
    > ipconfig /release *Con* ... release all matching connections, eg. "Local Area Connection 1" or
    "Local Area Connection 2"

If your PC is connected to the a device such as broadband router or cable MODEM with a DHCP server, you are using automatic IP addresses, and you want to test it, config /release and ipconfig /renew to release and renew the IP address lease. You should see it change, however, the new IP address may be the same as the old one.