IBM Support

How to identify hostname and host ID for license generation

Question & Answer


How do you identify the hostname and host ID for IBM Rational license generation on the various platforms?


Host information (host name and host ID) are required to enter for floating / node locked license generation.

The host ID is a generic term used to identify the hardware to which you will be registering your key.


To get the hostname of the target machine, enter "hostname" into a system window

  • a UNIX/Linux shell
  • Windows Command Prompt

The lmhostid utility (Selecting the “Host ID”link on License Key Center will launch a pop-up with instructions on getting your host ID. ) returns the FLEXlm hostid of the current platform.

Invoked without any arguments, lmhostid displays the default hostid type for current platform.

The license server host ID can also be found by using the corresponding command from the table below for your license server's operating system.

Operating System
Type of identifier
32-bit hostiduname -m (returns 000276513100), then remove last 2 digits, and use remaining last 8 digits02765131
DEC Alphaethernet addressnetstat -i080020005532
HP32-bit hostiduname -i and convert to hex, or prefix with #778DA450 or #2005771344
ethernet addresslanscan (station address without leading '0x')0000F0050185
Linuxethernet address/sbin/ifconfig eth0 and remove colons from HWaddr 00:40:05:16:E5:2500400516E525
SCOHostid Stringuname -x (returns SCO00354), then prefix with 'ID_STRING='ID_STRING=SCO00354
SGI32-bit hostid/etc/sysinfo -s and convert to hex, or prefix with #69064C3C or #1762020412
SUN32-bit hostidhostid 170a3472
ethernet addressncp080020005532
Microsoft Windowsethernetipconfig/all: Ethernet Adapter local area connection:
Physical Address: 00-1F-E2-14-FD-3E then remove '-'
Disk serial numbervol: look for Drive C 'Volume Serial Number is', 6806-ABBD
and then remove '-'

Dongle - parallel port hardware keySticker which is behind the dongle contains the Dongle ID 9-7A0A604D9-7A0A604D

Internal Use Only

Do not pull this doc from the Web because it is referred to at:

A Japanese technote 1511966 Database 'DCF Technotes (Rational)', View 'AllDocNumber', Document 'ライセンス・キー取得時に求められる [ホスト名] と [ホスト ID] の確認方法について
' exists, which is a translation of this English document.

IMPORTANT: If this technote is modified with significant changes, the changes need to also be applied to the Japanese through an update request. Spelling and grammatical changes are likely not significant
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Copy and paste this text block that is between the asterisks into an update doc for the Japanese version if updates are required:
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Please review the content and update this Japanese version as required. When complete, send the Japanese technote to be re-published.




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Document Information

Modified date:
16 June 2018