What this means
The IEEE assigned the MA-L block 001A58 to CCV Deutschland GmbH - Celectronic eHealth Div.. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 00:1A:58, it is CCV Deutschland GmbH - Celectronic eHealth Div. hardware.