I suppose I am 99.99% sure it cannot be done since you need either ILO IP or DNS name to connect, but I'm hoping to be proven wrong.
Is there a trick perhaps to enable it via RIBCL and cpqlocfg.exe?
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Without more details about your scenario, here's some thoughts. You need to talk to something, somehow.
Out of the box, the iLO might be enabled and on DHCP (or static IP), so if you have the physical tag, you can get there. If you know that it's been configured and turned off, and there's no OS, you might have a couple of options :
Remote KVM, assuming your infrastructure has it.
PXE booting might be enabled on the machine, in which case you could boot something that has the HP tools in it, like a small Linux, or maybe even SmartStart.
Assuming you're talking about HP servers, out of the box the iLO is configured to get an IP via DHCP and have a hostname based on the serial number of the server. The server has this hostname and the default password written either on a removable tag, a sticker on the top of the server, or a pull-out tag on the front panel.
But if your iLO is actually disabled and you have no OS on the server, then you're out of luck.
These are all approaches to dealing with batch installations on new HP hardware. You don't specify the server models, though. If Gen8, the provisioning tool is baked into the server.