I've finally got round to re-test this. Thanks for the comment.
I have updated the transforms and .csv file but the lookup is still not happening. The query completes but no loookups in the Manufacturers column.
Transforms
[splunk@lab local]$ more transforms.conf
[ieee-mac-oui]
filename = ieee-mac-oui.csv
match_type = WILDCARD(Vendor_MAC)
ieee-mac-oui.csv
[splunk@lab lookups]$ head ieee-mac-oui.csv
Vendor_MAC,Manufacturer
000000,XEROX CORPORATION
000001*,XEROX CORPORATION
000002*,XEROX CORPORATION
000003*,XEROX CORPORATION
000004*,XEROX CORPORATION
000005*,XEROX CORPORATION
000006*,XEROX CORPORATION
000007*,XEROX CORPORATION
000008*,XEROX CORPORATION
Query
The MAC address field is mac
index=windhcp | lookup ieee-mac-oui Vendor_MAC as mac OUTPUT Manufacturer | table hostname, mac, src_ip, Manufacturer
This query now works but some entries does not show the Manufacturer. Will need to double-check the ieee-mac-oui.csv. Thanks for all the help. I will mark this as answered.
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