/proc/partitions

cat /proc/partitions
major minor  #blocks  name

  7        0      28764 loop0
  7        1      18416 loop1
  7        2      99312 loop2
  7        3      98944 loop3
259        0    8388608 nvme0n1
259        1    8387567 nvme0n1p1

See also

• Block devices, partition, GUID Partition Table (GPT), fdisk, parted, Kpartx, partition, /proc/partitions, blockdev, mkfs, partprobe, diskpart (Windows), fdisk -l /dev/nbd0