Ipconfig

From Wikipedia, the free encyclopedia

The correct title of this article is ipconfig. The initial letter is shown capitalized due to technical restrictions.

Screenshot of ipconfig /all output in Windows XP

ipconfig in Windows is a wrapper for the command line utility to print the local computer's network current configuration and to control the Windows Service that acts as its DHCP Client. Similar GUI tools named winipcfg & wntipcfg also exist. The former pre-dates ipconfig.

ipconfig in Mac OS X serves as a wrapper to the IPConfiguration agent, and can be used to control the BootP and DHCP client from the command line interface. Like most UNIX-based operating systems, Mac OS X also uses ifconfig for more direct control over network interfaces, such as configuring static IP addresses.

1 Available command-line switches in Windows
2 Sample output in Windows
3 See also
4 External Links

[edit] Available command-line switches in Windows

/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.

[edit] Sample output in Windows

[edit] Show connection status

C:\>ipconfig /all
Windows 2000 IP Configuration
Host Name . . . . . . . . . . . . : wikipedia
Primary DNS Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : wikipedia.org
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . : wikipedia.org
Description . . . . . . . . . . . : Intel(R) PRO/100 VE Netwon #3
Physical Address. . . . . . . . . : 00-D0-B7-A6-F1-11
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.0.100
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 192.168.0.3
DHCP Server . . . . . . . . . . . : 192.168.0.1
DNS Servers . . . . . . . . . . . : 192.168.0.1
Primary WINS Server . . . . . . . : 192.168.0.75
Lease Obtained. . . . . . . . . . : 27 May 2004 09:04:06
Lease Expires . . . . . . . . . . : 30 May 2004 09:04:06

[edit] Release and Renew DHCP lease

C:\>ipconfig /release
Windows 2000 IP Configuration
IP address successfully released for adapter "Local Area Connection 2"

C:\>ipconfig /renew
Windows 2000 IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . : wikipedia.org
IP Address. . . . . . . . . . . . : 192.168.0.100
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 192.168.0.1

[edit] Flushing the DNS cache

C:\>ipconfig /flushdns
Windows 2000 IP Configuration
Successfully flushed the DNS Resolver Cache.

[edit] Registering DNS resource records

C:\>ipconfig /registerdns
Windows 2000 IP Configuration
Registration of the DNS resource records for all adapters of this computer has been initiated.
Any errors will be reported in the Event Viewer in 15 minutes.