Hi,
this is the bug discussion forum, you should move the question to a LAN forum.
Standard (untagged) Ethernet frames do not carry any VLAN information.
The IEEE 802.1q format has a 12 bit VLAN field, that's where the range 0-4095 comes from.
The Cisco proprietary ISL had a 15 bit VLAN field but ISL has become less important.
Useful Link: Inter-Switch Link and IEEE 802.1Q Frame Format
HTH
Rolf
