What this means
The IEEE assigned the MA-S block 70B3D5998 to Kita Kirmizi Takim Bilgi Guvenligi Danismanlik ve Egitim A.S.. 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 70:B3:D5:99:8, it is Kita Kirmizi Takim Bilgi Guvenligi Danismanlik ve Egitim A.S. hardware.