Try looking for QEMM, extracting its contents and running MANIFEST from DOS mode. It should tell you what areas of memory are being used. BTW, if you want more UMBs, try adding "I=B000-B7FF" to EMM386's command line. It uses the memory normally used by the mono graphics adapter as more RAM. It also was one of the switches on my first PC.

BTW, QEMM should be at REMOVED. Just search for it.

Depending on the card it's either C800-CFFF or D000-DFFF range should be excluded. That's at least what I've personally encountered.
Sometimes it's possible to narrow this range.
But I don't think there is a range that works for all cards. Usually the manual mentiones specificaly the range that should be excluded.

Run MSD in DOS and then pick Memory; it might show the used range in the map.

I forgot about MSD. Or maybe I never used it. It comes with DOS or Win9x and so may be easier to access than MANIFEST. Sorry!

My experience is that there isn't a safe range for I/O address reservations because those may be dependant on the memory map of the individual laptop and the socket services choose what range to use. But most of the ones I've set up seem to like using C800 to CFFF as the working PCMCIA memory and with "X=C800-CFFF" as an exclusion from emm386.

What socket services are you using? Or is it a specific PCMCIA card that uses an enabler, or one of those all-in-one PCMCIA ATA enabler software things?