0x8100

0x8100 is a hexadecimal literal commonly used in computing to represent the 16-bit value 33024. The prefix 0x signals hexadecimal notation, and such literals appear in source code, data formats, and protocol fields to express fixed values concisely.

In networking, 0x8100 has a specific meaning as an EtherType value for VLAN tagging. It indicates an IEEE 802.1Q VLAN-tagged frame. When an Ethernet frame carries a VLAN tag, the EtherType field is set to 0x8100 to signal that the next two bytes contain the Tag Control Information (TCI), which specifies the VLAN ID and priority. Devices along the network path use this information to route the frame to the correct VLAN.

In Unicode notation, 0x8100 may be used to refer to the code point U+8100. This is a character in the CJK Unified Ideographs block. The actual glyph shown depends on the font and rendering system, but the code point is the identifier for that particular character in Unicode.

In programming more generally, 0x8100 appears as a common hex constant. It can be used in bitwise operations, masks, or as a field value in various protocols and data structures. Memory storage of the value is endianness-dependent: in big-endian systems the bytes are 0x81 followed by 0x00, while in little-endian systems they appear as 0x00 followed by 0x81.

Overall, 0x8100 serves as a versatile hexadecimal representation used across networking, character encoding, and general software development.