IPCONFIG

This diagnostic command displays all current TCP/IP network configuration values. This command is of particular use on systems running DHCP, allowing users to determine which TCP/IP configuration values have been configured by DHCP.

IPCONFIG /?

IPCONFIG [/all | /renew [adapter] | /release [adapter]] [/displaydns] [/flushdns] [/registerdns] [/setclassid adapter [classid]] [/showclassid adapter]

All of the current TCP/IP configuration values to the user, including IP address and subnet mask:

IPCONFIG

none.

/? (NTXP)

Displays help.

/all (NT3.5)

Produces a full display. Without this switch, ipconfig displays only the IP address, subnet mask, and default gateway values for each network card.

/displaydns (NT2000)

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.

/flushdns (NT2000)

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.

/registerdns (NT2000)

Initiates manual dynamic registration for the DNS names and IP addresses that are configured at a computer. You can used 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.

/release [adapter] (NT3.5)

Releases the current DHCP configuration. This option disables TCP/IP on the local system and is available only on DHCP clients. To specify an adapter name, type the adapter name that appears when you use ipconfig without parameters.

/renew [adapter] (NT3.5)

Renews DHCP configuration parameters. This option is available only on systems running the DHCP Client service. To specify an adapter name, type the adapter name that appears when you use ipconfig without parameters.

/setclassid adapter [classid] (NTXP)

Configures the DHCP class ID for a specified adapter. To set the DHCP class ID for all adapters, use the asterisk (*) wildcard character in place of Adapter. Available only on computers with adapters that are configured to obtain an IP address automatically. If a DHCP class ID is not specified, the current class ID is removed.

/showclassid adapter (NTXP)

Displays the DHCP class ID for a specified adapter. To see the DHCP class ID for all adapters, use the asterisk (*) wildcard character in place of Adapter. Available only on computers with adapters that are configured to obtain an IP address automatically.

PING

none.

none.

none.

External

DOS

none

Windows

none

Windows NT

NT3.5 NT3.51 NT4 NT2000 NTXP NT2003