redzilla
All tools

IP Addressing

Layer 2

Performance

Wireless

CCTV

Optical fiber

Power

Datacenter

AV

Voice

Diagnostics

Calculation

Security

Layer 2

VLAN Decoder

Paste the 16-bit TCI or the full 32-bit 802.1Q tag in hex to decode TPID, PCP, DEI and VLAN ID, or build the tag by choosing VID, priority and DEI. Includes the binary breakdown of the TCI. Nothing is sent to any server.

Mode

Accepts 0x… or just hex digits. 4 digits = TCI; 8 digits = tag (TPID+TCI).

Examples
redzilla.cl — vlan 
 
 
 
 TCI —  
 
 Tag —  
 
 VID —  
 
  
 
 
PCP · 802.1p priority
 
—
 
—
 
 
 
DEI
 
—
 
—
 
 
 
VLAN ID (VID)
 
—
 
—
 
 
  
 
Binary breakdown of the TCI (16 bits)
 
 
  PCP (3 bits)
 DEI (1 bit)
 VID (12 bits)

 
 
 802.1p priority table (PCP) 
 
  
PCPAcronymTraffic class
   
 
 
 
 802.1Q tag structure 
 
 Tag 4 bytes inserted after the source MAC:
TPID (16 bits) + TCI (16 bits).

 
 TPID 0x8100 = 802.1Q (C-Tag) ·
0x88A8 = 802.1ad (S-Tag / QinQ) · 0x9100 = legacy / non-standard.

 
 TCI PCP = (TCI >> 13) & 0x7 ·
            DEI = (TCI >> 12) & 0x1 · VID = TCI & 0x0FFF.

 
 
 
 
 
Runs locally in your browser · no sign-up · nothing leaves your browser