Ipconfig Displays all current TCP/IP network
configuration values and refreshes Dynamic Host Configuration
Protocol (DHCP) and Domain Name System (DNS) settings. Used
without parameters, ipconfig displays the IP address, subnet
mask, and default gateway for all adapters.
Syntax
ipconfig [/all] [/renew [Adapter]] [/release [Adapter]] [/flushdns]
[/displaydns] [/registerdns] [/showclassid Adapter] [/setclassid
Adapter [ClassID]]
Parameters
/all
Displays the full TCP/IP configuration for all adapters. Without
this parameter, ipconfig displays only the IP address, subnet
mask, and default gateway values for each adapter. Adapters
can represent physical interfaces, such as installed network
adapters, or logical interfaces, such as dial-up connections.
/renew [Adapter]
Renews DHCP configuration for all adapters (if an adapter is
not specified) or for a specific adapter if the Adapter parameter
is included. This parameter is available only on computers with
adapters that are configured to obtain an IP address automatically.
To specify an adapter name, type the adapter name that appears
when you use ipconfig without parameters.
/release [Adapter]
Sends a DHCPRELEASE message to the DHCP server to release the
current DHCP configuration and discard the IP address configuration
for either all adapters (if an adapter is not specified) or
for a specific adapter if the Adapter parameter is included.
This parameter disables TCP/IP for adapters configured to obtain
an IP address automatically. To specify an adapter name, type
the adapter name that appears when you use ipconfig without
parameters.
/flushdns
Flushes and resets the contents of the DNS client resolver cache.
During DNS troubleshooting, you can use this procedure to discard
negative cache entries from the cache, as well as any other
entries that have been added dynamically.
/displaydns
Displays the contents of the DNS client resolver cache, which
includes both entries preloaded from the local Hosts file and
any recently obtained resource records for name queries resolved
by the computer. The DNS Client service uses this information
to resolve frequently queried names quickly, before querying
its configured DNS servers.
/registerdns
Initiates manual dynamic registration for the DNS names and
IP addresses that are configured at a computer. You can use
this parameter to troubleshoot a failed DNS name registration
or resolve a dynamic update problem between a client and the
DNS server without rebooting the client computer. The DNS settings
in the advanced properties of the TCP/IP protocol determine
which names are registered in DNS.
/?
Displays help at the command prompt.
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