Sometimes one person tells me an airstrip is on BLM land, and another person tells me the same strip is private. Grrr...
I occasionally call a BLM office and give them a lat/long and ask them to verify the ownership. I just did that very recently, and they suggested that I use the interactive map on geocommunicator.gov and look it up for myself. I tried using it a couple of years ago, but it was so slow and buggy that I gave up on it. It's now much improved, and reasonably usable.
To use it, go to http://www.geocommunicator.gov, then click on the blue link in the middle of the page that says "Interactive Maps".
Now, double click on the map to zoom in to find the airstrip. You can switch from the street map to a topo map or a sat image at the bottom of the layer tab on the right.
Finally, check the "surface management agency" checkbox on the layer tab on the right. When it's checked, BLM land will appear yellow, and BLM Wilderness land will appear orange. (Look at the Black Rock Desert for an example of the Orange color, it's not much darker than the yellow).
I've looked up some BLM boundaries with which I was already familiar, and it seemed to be accurate in those cases.
I was able to verify that Barrel Springs airstrip (NV), Iowa Canyon Ranch airstrip (NV), the old 45 Ranch airstrip (ID), and a couple of unnamed strips were all on BLM land.
