IPCONFIG – Windows CMD Command
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Configure IP (Internet Protocol configuration)
IPCONFIG /all Display full configuration information.
IPCONFIG /release [adapter]
Release the IP address for the specified adapter.
IPCONFIG /renew [adapter]
Renew the IP address for the specified adapter.
IPCONFIG /flushdns Purge the DNS Resolver cache.
IPCONFIG /registerdns Refresh all DHCP leases and re-register DNS names.
IPCONFIG /displaydns Display the contents of the DNS Resolver Cache.
IPCONFIG /showclassid adapter
Display all the DHCP class IDs allowed for adapter.
IPCONFIG /setclassid adapter [classid]
Modify the dhcp class id.
If the Adapter name contains spaces, use quotes: “Adapter Name”
Wildcard characters * and ? are allowed, see the examples below
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.
If you remote into a computer and run ipconfig /release it will kill your connection
For setclassid, if no CLASS ID is specified, then the CLASS ID is removed.
DHCP User Classes allow additional or modified DHCP options to be applied to a subset of computers on the network, as identified by a CLASS ID. For example, a different gateway, DNS server, or lease time.
This requires configuring the CLASS ID appropriately on the DHCP server. see RFC 3004
Show detailed information
C:\> ipconfig /all
Release and Renew all adapters:
Release and Renew all adapters – one liner for remote use:
ipconfig /release && ipconfig /renew
Renew any connection that has a name starting with EL:
ipconfig /renew EL*
Release all connections matching *Con*, eg. “Local Area Connection 1” or “Local Area Connection 2”:
ipconfig /release *Con*
Set the DHCP class ID for the named adapter to TEST:
ipconfig /setclassid "Local Area Connection" TEST