Kldstat command

On FreeBSD, you can use kldstat command to display the status of any files dynamically linked into the kernel:

# kldstat
Id Refs Address            Size     Name
 1    6 0xffffffff80200000 17bc6a8  kernel
 2    1 0xffffffff81a11000 56c6     fdescfs.ko
 3    1 0xffffffff81a17000 2ba8     uhid.ko

If you want more detailed info, you can use -v option:

# kldstat -v
Id Refs Address            Size     Name
 1    6 0xffffffff80200000 17bc6a8  kernel (/boot/kernel/kernel)
 Contains modules:
  Id Name
  386 if_lo
  398 newreno
  373 elf32
  372 elf64
  374 shell
.....

Reference:
KLDSTAT(8)).